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NAME:______________________________________________PER:______SCORE:_______ FORCE UNIT TEST (Part 1- Net Forces & Newton's Law) 1. According to Newton's First Law of Motion, an object at rest will remain at rest and an object in motion will continue to move at a constant velocity because the net forces are __________________. A. B. C. D. balanced unbalanced acting in pairs the same 2. When the net force is greater than 0 Newtons, forces are_____________________ and the velocity of the object ____________________. A. B. C. D. balanced, does not change unbalanced, changes balanced, changes unbalanced, does not change 3. The magnitude and direction of the net force is ___________ and forces are __________________. 10 N down 40N up A. B. C. D. 50 N up and unbalanced 30 N down and unbalanced 30 N up and balanced 30 N up and unbalanced 4. An object is on a table. It is not moving. One force of 15 N is acting to the right and another force of 15 N is acting the left. The magnitude and direction of the net force is _______________ and forces are _________. 15 N right A. B. C. D. 15 N left 30 N left, balanced 30 N right, balanced 0 N, balanced 0 N, unbalanced 5. A force of 180 N is pushing up on an object. Another force of 60 N is pushing down on the same object. What is the magnitude and direction of the net force? A. B. C. D. 240 Newtons, down 240 Newtons, up 120 Newtons, down 120 Newtons, up 6. A force of 200 N is pushing down and another force of 200 N is pushing up. A third force is pushing with 50 N to the right and a fourth force is pushing with 35 N to the left. What is the magnitude and direction of the net force? (Hint: Draw free body diagram to help you!) A. B. C. D. 400 Newtons up and 15 Newtons right 400 Newtons down and 15 Newtons left 15 Newtons left 15 Newtons right 7. A soccer ball is not moving and is on the grass in the soccer field. The net force acting on the soccer ball is ______________. When a soccer player runs towards this soccer ball and kicks it, the soccer ball moves North. The net force of the soccer ball is __________________. A. B. C. D. balanced, unbalanced unbalanced, balanced balanced, balanced unbalanced, unbalanced 8. If object A is moving at a constant speed and moving in the same direction, then the net force is __________________________. If object B is accelerating, then the net force is ______________. A. B. C. D. unbalanced, balanced balanced, unbalanced balanced, balanced unbalanced, unbalanced 9. Which of the following is NOT true about net forces that are balanced? A. B. C. D. Balanced forces do not change an object's velocity. If an object is not moving (static), then balanced forces causes the object to move. If an object is moving (kinetic), then balanced forces will not change its velocity. If an object is not moving (static), then balanced forces will not affect it and the object will stay at rest. 10. Which of the following does NOT correctly describe the major differences between balanced forces and unbalanced forces? A. Balanced forces have a net force that is 0 Newtons, while unbalanced forces have net force that is greater than 0 Newtons. B. Balanced forces cause nonmoving objects to move while unbalanced forces cause nonmoving objects to stop or stay at rest. C. Balanced forces do not change the velocity while unbalanced forces change the velocity. D. Balanced forces do not affect the speed nor direction while unbalanced forces can cause a change in the speed, direction, or both. 11. Which of the following formula correctly describes Newton's Second Law of Motion. A. B. C. D. Force = Mass x Acceleration Force = Mass/Acceleration Force = Acceleration/Mass Force= Distance/Time 12. An object with a mass of 20 kg is accelerating at a rate of 6 m/s/s. What is the amount of force? 13. An object has a mass is 36 kg. It’s acceleration rate is 4.5 m/s/s. Find force. 14. A 100 kg object accelerates at a rate of 2.5 m/s 2. Find force. 15. How much force is needed to accelerate a 48 kg object at 3 m/s 2 ? 16. The force formula can be rearranged to solve for mass. A. B. C. D. Circle the correct formula for mass. Mass= Force x Acceleration Mass= Force/Acceleration Mass= Acceleration/Force Mass= Speed x Force 17. The acceleration of the object is 3 m/s2 and force exerted on it is 12 N. Find the mass. 18. The rate of acceleration for a basketball that is falling to the ground is 9.8 m/s/s. The force exerted on the basketball is 29.4 N. What is the mass of the object? Answer:_____________________kg 19. The force formula can be rearranged to solve for acceleration. Circle the answer. A. B. C. D. Acceleration = Force x Mass Acceleration = Mass x Force Acceleration = Force/Mass Acceleration = Mass/Force 20. A force of 360 N is being exerted on an object with a mass of 60 kg. Find the acceleration of the object. 21. A handball has a mass of 5 kg. A force of 2.5 N was used to move the handball. What is the acceleration rate of the handball? 22. An empty box has a mass of 5 kilograms. You put a few objects into the box. Now the mass of the box increases to 25 kilograms. Which of the following statements is true? A. B. C. D. When the mass increases, the amount of force needed to lift the box decreases. When the mass increases, the amount of force needed to lift the box increases. When the mass increases, the amount of force needed to lift the box remains the same. When the mass increases, the amount of force needed to lift the box is not affected. 23. First, Manuel throws a football with a force of 10 Newtons. Later, Manuel uses less force and throws the football with a force of 5 Newtons. Which statement is true? A. B. C. D. The amount of force used decreases so the acceleration rate will decrease. The amount of force used decreases so the acceleration rate will increase. The amount of force used decreases but the acceleration rate remains the same. The amount of force used decreases but the acceleration rate is not affected. 24. A tennis ball has a mass of 1 kilogram. A basketball has a mass of 4 kilograms. Sarah uses the same amount of force to throw each ball, using a force of 40 Newtons. Based on this information, which of the following statement is true? A. B. C. D. The tennis ball will have a smaller acceleration rate than the basketball. The tennis ball will have a greater acceleration rate than the basketball. The tennis ball will have the same acceleration rate as the basketball. The mass does not affect the acceleration rate of the tennis ball or the basketball. 25. Both object A and object B start at the same initial position (location). The speed of object A increased from 10 m/s to 20 m/s. The speed of object B remains constant at 10 m/s. Since object A accelerated, it will move _______________________distance than object B. A. B. C. D. a smaller a greater the same a similar 26. There are two identical toy cars on wheels. The orange toy car has a mass of 25 kilograms. The green toy car has a mass of 50 kilograms. If these two toy cars are on a track and collide, what will happen to each of the cars right after the collision? <-----left ________________Orange Car A. B. C. D. Green Car______________________------> right Orange car will accelerate more and move a greater distance. Orange car will accelerate less and move a greater distance. Green car will accelerate more and move a greater distance Green car will accelerate less and move a greater distance. 27. According to the force formula, if the amount of force increases, then the acceleration rate will _______________________ and the speed of the object will _____________________________. A. increase, decrease B. decrease, decrease C. increase, increase D. decrease, increase 28. There are many factors that would affect how fast a bowling ball moves. Which of the two factors listed below is most important in determining the acceleration rate of a bowling ball? A. B. C. D. direction and time mass and direction force and direction force and mass 29. There are two marbles, a green marble and a red marble that are on a track. Both the green and red marble has the same amount of mass. If the green marble is at rest and the red marble hits it, what happens? <--- Left_______________________0_________0_____________________________Right ----> green marble red marble hits green marble A. B. C. D. The green marble will accelerate and move to the left. The green marble will not accelerate and will stay at rest. The green marble will accelerate and move to the right. The green marble will not move and cause the red marble to move to the left. 30. A different colored marble, a purple marble has a mass that is five times more than the mass of the green marble and red marble. The purple marble is moving to the left and hits the green marble while it is at rest. Since the purple marble has more mass than the red marble, when it hits the green marble, it will cause the green marble to _____________than in the example using the red marble. <--- Left_______________________0_________O_____________________________Right ----> green marble purple marble hits green marble A. accelerate less and move a shorter distance B. accelerate less and move a greater distance C. accelerate more and move a shorter distance D. accelerate more and move a greater distance. Use this data table to help you answer the questions below. Object Force Mass Object Force Mass 1 10 N 40 kg 50 N 15 kg 5 2 50 N 25 kg 6 40 N 40 kg 3 50 N 50 kg 7 60 N 40 kg 4 50 N 100 kg 8 80 N 40 kg 31. When you compare the acceleration rate of objects 1, 2, 3, and 4, which object has the greatest acceleration? A. B. C. D. Object 1 Object 2 Object 3 Object 4 32. When you compare the acceleration rate of objects 5, 6, 7, and 8, which object has the greatest acceleration? A. B. C. D. Object 5 Object 6 Object 7 Object 8 33. Which objects have an accelerate rate that is less than 1 m/s/s? A. B. C. D. All the objects (objects 1-8) Objects 1, 2, 5 Objects 3 and 6 Objects 4, 5 34. Which of the following objects has the slowest acceleration rate? A. B. C. D. Object 1 Object 4 Object 5 Object 8 35. Based on the data table, what would be the velocity of object 2 at 5 seconds? (Assume that at 0 seconds, object 2 was at rest and the velocity was 0 m/s.) A. B. C. D. 2 m/s 5 m/s 8 m/s 10 m/s *ANSWER KEY * ANSWER KEY * ANSWER KEY* FORCE UNIT TEST (Part 1: Net Force & Newton's Laws) 1. According to Newton's First Law of Motion, an object at rest will remain at rest and an object in motion will continue to move at a constant velocity because the net forces are __________________. A. balanced B. unbalanced C. acting in pairs D. the same 2. When the net force is greater than 0 Newtons, forces are_____________________ and the velocity of the object ____________________. A. balanced, does not change B. unbalanced, changes C. balanced, changes D. unbalanced, does not change 3. The magnitude and direction of the net force is ___________ and forces are __________________. 10 N down 40N up A. B. C. D. 50 N up and unbalanced 30 N down and unbalanced 30 N up and balanced 30 N up and unbalanced 4. An object is on a table. It is not moving. One force of 15 N is acting to the right and another force of 15 N is acting the left. The magnitude and direction of the net force is _______________ and forces are _________. 15 N right A. B. C. D. 15 N left 30 N left, balanced 30 N right, balanced 0 N, balanced 0 N, unbalanced 5. A force of 180 N is pushing up on an object. Another force of 60 N is pushing down on the same object. What is the magnitude and direction of the net force? A. 240 Newtons, down B. 240 Newtons, up C. 120 Newtons, down D. 120 Newtons, up 6. A force of 200 N is pushing down and another force of 200 N is pushing up. A third force is pushing with 50 N to the right and a fourth force is pushing with 35 N to the left. What is the magnitude and direction of the net force? (Hint: Draw free body diagram to help you!) A. B. C. D. 400 Newtons up and 15 Newtons right 400 Newtons down and 15 Newtons left 15 Newtons left 15 Newtons right 7. A soccer ball is not moving and is on the grass in the soccer field. The net force acting on the soccer ball is ______________. When a soccer player runs towards this soccer ball and kicks it, the soccer ball moves North. The net force of the soccer ball is __________________. A. B. C. D. balanced, unbalanced unbalanced, balanced balanced, balanced unbalanced, unbalanced 8. If object A is moving at a constant speed and moving in the same direction, then the net force is __________________________. If object B is accelerating, then the net force is ______________. A. B. C. D. unbalanced, balanced balanced, unbalanced balanced, balanced unbalanced, unbalanced 9. Which of the following is NOT true about net forces that are balanced? A. B. C. D. Balanced forces do not change an object's velocity. If an object is not moving (static), then balanced forces causes the object to move. If an object is moving (kinetic), then balanced forces will not change its velocity. If an object is not moving (static), then balanced forces will not affect it and the object will stay at rest. 10. Which of the following does NOT correctly describe the major differences between balanced forces and unbalanced forces? A. Balanced forces have a net force that is 0 Newtons, while unbalanced forces have net force that is greater than 0 Newtons. B. Balanced forces cause nonmoving objects to move while unbalanced forces cause nonmoving objects to stop or stay at rest. C. Balanced forces do not change the velocity while unbalanced forces change the velocity. D. Balanced forces do not affect the speed nor direction while unbalanced forces can cause a change in the speed, direction, or both. 11. Which of the following formulas correctly describes Newton's Second Law of Motion. A. Force = Mass x Acceleration B. Force = Mass/Acceleration C. Force = Acceleration/Mass D. Force= Distance/Time 12. An object with a mass of 20 kg is accelerating at a rate of 6 m/s/s. What is the amount of force applied on the object? Circle your answer with units. F= ma F= (20 kg)(6 m/s/s) F= 120 N 13. An object has a mass is 36 kg. It’s acceleration rate is 4.5 m/s/s. Find force. Circle your answer with units. F= ma F= 36 kg (4.5 m/s/s) F= 162 N 14. A 100 kg object accelerates at a rate of 2.5 m/s2. Find force.. F= ma F= 100 kg (2.5 m/s/s) F= 250 N 15. How much force is needed to accelerate a 48 kg object at 3 m/s2 ? F= ma F= 48 kg (3 m/s/s) F= 144 N 16. The force formula can be rearranged to solve for mass. mass. A. B. C. D. Circle the correct formula for Mass= Force x Acceleration Mass= Force/Acceleration Mass= Acceleration/Force Mass= Speed x Force 17. The acceleration of the object is 3 m/s2 and force exerted on it is 12 N. Find the mass. M=F/A M= 12 N/ 3 m/s/s M= 4 kg 18. The rate of acceleration for a basketball that is falling to the ground is 9.8 m/s/s. The force exerted on the basketball is 29.4 N. What is the mass of the object?. M= F/A M= 29.4 N/ 9.8 m/s/s M= 3 kg 19. The force formula can be rearranged to solve for acceleration.. A. B. C. D. Acceleration = Force x Mass Acceleration = Mass x Force Acceleration = Force/Mass Acceleration = Mass/Force 20. A force of 360 N is being exerted on an object with a mass of 60 kg. Find the acceleration of the object. A= F/M A= 360 N/ 60 kg A= 6 m/s/s 21. A handball has a mass of 5 kg. A force of 2.5 N was used to move the handball. What is the acceleration rate of the handball? Circle your answer with units. A= F/M A= 2.5 N/ 5 kg A= 0.5 m/s/s 22. An empty box has a mass of 5 kilograms. You put a few objects into the box. Now the mass of the box increases to 25 kilograms. Which of the following statements is true? A. B. C. D. When the mass increases, the amount of force needed to lift the box decreases. When the mass increases, the amount of force needed to lift the box increases. When the mass increases, the amount of force needed to lift the box remains the same. When the mass increases, the amount of force needed to lift the box is not affected. 23. First, Manuel throws a football with a force of 10 Newtons. Later, Manuel uses less force and throws the football with a force of 5 Newtons. Which statement is true? A. B. C. D. The amount of force used decreases so the acceleration rate will decrease. The amount of force used decreases so the acceleration rate will increase. The amount of force used decreases but the acceleration rate remains the same. The amount of force used decreases but the acceleration rate is not affected. 24. A tennis ball has a mass of 1 kilogram. A basketball has a mass of 4 kilograms. Sarah uses the same amount of force to throw each ball, using a force of 40 Newtons. Based on this information, which of the following statement is true? A. B. C. D. The tennis ball will have a smaller acceleration rate than the basketball. The tennis ball will have a greater acceleration rate than the basketball. The tennis ball will have the same acceleration rate as the basketball. The mass does not affect the acceleration rate of the tennis ball or the basketball. 25. Both object A and object B start at the same initial position (location). The speed of object A increased from 10 m/s to 20 m/s. The speed of object B remains constant at 10 m/s. Since object A accelerated, it will move _______________________distance than object B. A. a smaller B. a greater C. the same D. a similar 26. There are two identical toy cars on wheels. The orange toy car has a mass of 25 kilograms. The green toy car has a mass of 50 kilograms. If these two toy cars are on a track and collide, what will happen to each of the cars right after the collision? <-----left ________________Orange Car Green Car______________________------> right A. Orange car will accelerate more and move a greater distance. B. Orange car will accelerate less and move a greater distance. C. Green car will accelerate more and move a greater distance D. Green car will accelerate less and move a greater distance. 27. According to the force formula, if the amount of force increases, then the acceleration rate will _______________________ and the speed of the object will _____________________________. A. increase, decrease B. decrease, decrease C. increase, increase D. decrease, increase 28. There are many factors that would affect how fast a bowling ball moves. Which of the two factors listed below is most important in determining the acceleration rate of a bowling ball? A. B. C. D. direction and time mass and direction force and direction force and mass 29. There are two marbles, a green marble and a red marble that are on a track. Both the green and red marble has the same amount of mass. If the green marble is at rest and the red marble hits it, what happens? <--- Left_______________________0_________0_____________________________Right ----> green marble red marble hits green marble A. The green marble will accelerate and move to the left. B. The green marble will not accelerate and will stay at rest. C. The green marble will accelerate and move to the right. D. The green marble will not move and cause the red marble to move to the left. 30. A different colored marble, a purple marble has a mass that is five times more than the mass of the green marble and red marble. The purple marble is moving to the left and hits the green marble while it is at rest. Since the purple marble has more mass than the red marble, when it hits the green marble, it will cause the green marble to _____________than in the example using the red marble. <--- Left_______________________0_________O_____________________________Right ----> green marble purple marble A. accelerate less and move a shorter distance B. accelerate less and move a greater distance C. accelerate more and move a shorter distance D. accelerate more and move a greater distance. Use this data table to help you answer the questions below. Object Force Mass Object Force Mass 1 50 N 15 kg 5 10 N 40 kg 2 50 N 25 kg 6 40 N 40 kg 3 50 N 50 kg 7 60 N 40 kg 4 50 N 100 kg 8 80 N 40 kg 31. When you compare the acceleration rate of objects 1, 2, 3, and 4, which object has the greatest acceleration? A. B. C. D. Object 1 Object 2 Object 3 Object 4 32. When you compare the acceleration rate of objects 5, 6, 7, and 8, which object has the greatest acceleration? A. Object 5 B. Object 6 C. Object 7 D. Object 8 33. Which objects have an accelerate rate that is less than 1 m/s/s? A. B. C. D. All the objects (objects 1-8) Objects 1,2,5 Objects 3 and 6 Objects 4,5 34. Which of the following objects have the slowest acceleration rate? A. B. C. D. Object 1 Object 4 Object 5 Object 8 35. Based on the data table, what would be the velocity of object 2 at 5 seconds? (Assume that at 0 seconds, object 2 was at rest and the velocity was 0 m/s.) A. B. C. D. 2 m/s 5 m/s 8 m/s 10 m/s NAME:__________________________________________PER:_____SCORE:______ FORCE UNIT PART 2 TEST 1. Andrew is a professional skydiver who just jumped out of an airplane. Andrew realizes that it is now time to pull his parachute open. The force of gravity on Andrew is 600 N down. When he opens up the parachute, the force of air resistance is 750 N up. The magnitude and direction of the net force is _________________and forces are _____________________. A. 1350 Newtons up, balanced B. 1350 Newtons down, unbalanced C. 150 Newtons up, unbalanced D. 150 Newtons down, unbalanced 2. A professional skydiver, Judith, jumps out of an airplane and reaches a constant terminal velocity. Her speed does not increase. Air resistance equals to the downward force of gravity, 600 N. The magnitude and direction of the net force is __________and forces are __________. A. 0 Newtons down, balanced B. 0 Newtons down, unbalanced C. 1,200 Newtons down, balanced D. 1, 200 Newtons down, unbalanced 3. When Maria, a skydiver instructor, jumps out of the airplane, the acceleration rate of gravity on Maria is 9.8 m/s/s. If the Maria's mass is 100 kilograms, how much force is acting on her? A. 10.2 Newtons B. 98 Newtons C. 980 Newtons D. 9800 Newtons 4. On a different day, Maria jumps out of an airplane. The acceleration rate of the Earth on her is 9.8 m/s/s. However, since she is carrying more equipment today, her mass is now 120 kilograms. When Maria's mass increases, then the amount of force now acting on her will _____. The net force is ____. A. increase, 1176 Newtons down B. increase, 12.1 Newtons down C. decrease, 1176 Newtons down D. decrease, 12.1 Newtons down 5. Newton's Second Law of Motion describes the formula used to calculate the amount of force. What is the correct formula for force? A. Force = Mass/Acceleration B. Force= Acceleration/Mass C. Force= Mass (Acceleration) D. Force= Mass (Distance) 6. A. B. C. D. Which of the following is true about Earth's gravity? Gravity does not act on objects that are at rest or not moving. Gravity only acts on objects that are accelerating. Gravity only acts on objects that are falling down. Gravity acts on all objects on Earth, whether it is at rest or moving. 7. Which object below will have the greatest amount of force? Objects Mass Acceleration Object Mass Object R 5 kg 4 m/s/s Object T 15 kg Object S 10 kg 4 m/s/s Object U 20 kg A. Object R Acceleration 4 m/s/s 4 m/s/s B. Object S C. Object T D. Object U 8. A spring scale (shown on the right) measures the weight of an object. A box is attached to the spring scale. This box is not moving. The force pushing down on the box is called__________and the force pulling up is _____________________. A. spring force, gravity B. gravity, spring force C. gravity, air resistance D. gravity, normal force 9. The weight of the box attached to the spring scale is 30 Newtons down. The box is not moving. What is the magnitude and direction of the net force (cumulative force)? A. 30 N up B. 30 N down C. 0 N, no direction change D. 60 N, no direction change 10. There are three objects with different masses, a yellow, orange, and purple object that will be tested in a vacuum that has no air (no air resistance). If you dropped all three objects from the top of the tower at the same time in a vacuum, which object will hit the ground first? Yellow object = 20 kilograms Orange Object = 40 kilograms Purple object = 80 kilograms A. B. C. D. The yellow object will hit the ground first. The orange object will hit the ground first. The purple object will hit the ground first. All three objects will hit the ground at the same time. 11. Which object, yellow, orange, or purple, has the greatest inertia, greatest resistance to acceleration, and the greatest amount of weight due to Earth's gravity? Yellow object = 20 kilograms Orange Object = 40 kilograms Purple object = 80 kilograms A. B. C. D. yellow orange purple they all have the same amount of inertia, resistance to acceleration, and weight. 12. What factors would affect the acceleration of the object as Earth's gravity is pulling it down? A. air resistance B. mass of the object C. shape of the object D. all of the above. Two students, Dora and Diego, are in a car and on their way to a friend's birthday party. The car is moving to the right, heading East. 13. The force acting to move the car to the right is called the ____________________force. The force acting in the opposite direction is of the car is ______________force. A. B. C. D. friction, applied normal, gravity applied, friction gravity, normal 14. The force acting down on the car is called the _____force. The force acting in the up on the car is ______________force. A. friction, applied B. normal, gravity C. applied, friction D. gravity, normal 15. The driver, Diego, presses on the pedal and the car is moving faster and accelerating in the positive direction. Therefore, net forces are _______________ and the velocity___________. A. balanced, changes B. unbalanced, changes C. balanced, stays the same D. unbalanced, stays the same. 16. The mass of the car is 1, 000 kilograms. If it accelerates at a rate of 5 m/s/s, then the amount of force is ________________. A. 5,000 Newtons B. 1,000 Newtons C. 200 Newtons D. 15, 000 Newtons 17. Which of the following represents the correct formula for acceleration? A. Acceleration= Mass (Force) B. Acceleration= Mass/Force C. Acceleration = Force/Mass D. Acceleration= Mass(Velocity) 18. Which of the following combinations will cause the acceleration rate of an object to increase? A. less force and more mass B. less force and less mass C. more force and more mass D. more force and less mass 19. A car is moving to the right. The force of friction will act to the _______________. Friction is a force that will cause the speed of an object to _____________________. A. right, increase B. left, increase C. right, decrease D. left, decrease Mike has a mass of 50 kilograms (kg). He is wearing roller blades. When he pushes on the wall, the wall pushes back on him. 20. Mike pushes on the wall two times. The first time he pushed, he had a force of 30 Newtons. The second time he pushed, he had a force of 40 Newtons. When Mike pushes on the wall the second time, his acceleration rate was ______than the first time and he will move back a __________distance. A. less, greater B. more, smaller C. more, same D. more, greater 21. Which of Newton's Law states that when Mike pushes on the wall (action force), the wall pushes back on Mike (reaction force). A. Newton's First Law B. Newton's Second Law C. Newton's Third Law D. All of the above 22. With his backpack, Mike’s total mass equals 60 kg. If he pushes on the wall with a force of 120 N, what will be his acceleration rate? A. 7,200 m/s/s B. 720 m/s/s C. 20 m/s/s D. 2 m/s/s 23. Without his backpack, Mike’s total mass equals 50 kg. If he accelerates at a rate of 2 m/s/s, how much force did he use? A. 25 Newtons B. 0.04 Newtons C. 10 Newtons D. 100 Newtons 24. According to Newton's First Laws of Motion, unbalanced forces have a net force ____________. Therefore, unbalanced forces will change the _______________of an object. A. equal to 0 Newtons, velocity B. equal to 0 Newtons, distance C. greater than 0 Newtons, time D. greater than 0 Newtons, velocity 25. What would cause Mike to decelerate or have a decrease in his speed? A. less mass on his body B. more applied force C. more friction on the floor D. less friction on the floor Car A and car B have wheels and are on a track. The mass of car A is 16 kilograms and the mass of car B is 8 kilograms. (Note: The arrows below indicate which direction is left and which direction is right). Left Right Car A Car B 26. Car A is not moving. Car B moves towards car A and hits it. Which of the following statements is not true about Newton's Third Law of Motion in this example? A. the action force is car B hits car A and the reaction force is car A hits car B. B. the action force of car B is in the same direction as the reaction force of car A. C. the action force of car B has the same magnitude as the reaction force of car A. D. when car B hits car A, they make contact, and as a result, there is an action and reaction force. 27. Which of the following statements is not true as it relates to Newton's First Law of Motion in this example? A. Car B has more inertia and more resistance to a change in velocity. B. More forces is needed to accelerate car A than car B. C. When car A and car B are not moving, net forces are balanced. D. When car A and car B changes velocity that means that net forces are unbalanced. 28. If Car A and car B move towards each other and collide at the same time. What will happen to each car’s motion right after it bumps into each other? A. Both Car A and car B move to the left B. Both Car A and car B move to the right C. Car A will move to the left and car B will move to the right D. Car A will move to the right and car B will move to the left 29. The mass of car A is twice the mass of car B. If car A and car B collide at the same time, which statement correctly describes the movement of car A? A. Since car A has more mass than car B, it will move back a shorter distance. B. Since car A has more mass than car B, it will accelerate at a greater rate. C. Since car A has more mass than car B, it will move back a greater distance. D. A change in car A’s mass does not affect its acceleration rate or distance. 30. The mass of Car A is 16 kilograms and the net force is 8 Newtons, then what is its acceleration rate? A. 128 m/s/s B. 2 m/s/s C. 0.5 m/s/s D. 8 m/s/s 31. Which of the following factors will result in more friction between the floor and toy car? A. A smoother surface B. A car with less mass C. A car without wheels D. A surface that is slippery Nathan and Tina are both wearing roller skates. They have been asked to demonstrate Physics concepts for their Physical Science classmates. Use the information to help you answer the question. Note: Nathan has a mass of 48 kilograms and Tina has a mass of 40 kilograms. Nathan Tina Left <--------------- -- ------------------> Right 32. Nathan and Tina both push each other with the same amount of force. They push each other with a force of 144 Newtons. Nathan has a mass of 48 kilograms. What is Nathan's acceleration? Answer= ________________________________m/s/s 33. When Nathan and Tina push each other with a force of 144 Newtons, what will be Tina's acceleration rate? (Note: Tina's mass is 40 kilograms). Answer= ________________________________m/s/s 34. When you compare the distance that Nathan and Tina moves after they push each other, _____________ will move a greater distance because he/she has less ________________. A. Nathan, force B. Tina, force C. Nathan, mass D. Tina, mass 35. Which of Newton's Laws best describes the fact that when Nathan pushes Tina, he exerts a force of 144 N to the right on her while she exerts a force of 144 N to the left on him? A. Newton's First Law of Motion B. Newton's Second Law of Motion C. Newton's Third Law of Motion D. All of the above 36. Newton's First Law of Motion states that an object at rest will remain at rest and an object in motion, will continue to stay in motion, unless acted on by ______________________. A. a force B. an unbalanced force C. a balanced force D. a net/cumulative force 37. According to Newton's First Law of Motion, what is the net force of an object that is moving at a constant velocity? A. B. C. D. 0 Newtons greater than 0 Newtons 10 Newtons none of the above 38. According to Newton's Second Law of Motion, the amount of unbalanced force is directly related to what two variables? A. B. C. D. mass and acceleration mass and velocity speed and time velocity and direction 39. Based on the data in the chart, whose scooter had the greatest amount of force? Students mass of scooter (kg) acceleration rate of scooter (m/s/s) Henry 2 4 Victor 2.5 2 Rebecca 3 3 Jazmine 3.5 1 A. B. C. D. Henry Victor Rebecca Jazmine 40. Newton's Third Law of Motion states that for every action, there is an equal but opposite reaction. This means that the pair of forces have _________magnitude and ______direction. A. B. C. D. the same, the same the same, opposite different, the same different, opposite *ANSWER KEY * ANSWER KEY * FORCE UNIT PART 2 TEST SCORE:_________/40 1. Andrew is a professional skydiver who just jumped out of an airplane. Andrew realizes that it is now time to pull his parachute open. The force of gravity on Andrew is 600 N down. When he opens up the parachute, the force of air resistance is 750 N up. The magnitude and direction of the net force is _________________and forces are _____________________. A. 1350 Newtons up, balanced B. 1350 Newtons down, unbalanced C. 150 Newtons up, unbalanced D. 150 Newtons down, unbalanced 2. A professional skydiver, Judith, jumps out of an airplane and reaches a constant velocity. Her speed does not increase. Air resistance equals to the downward force of gravity, 600 N. The magnitude and direction of the net force is __________and forces are __________. A. 0 Newtons down, balanced B. 0 Newtons down, unbalanced C. 1,200 Newtons down, balanced D. 1, 200 Newtons down, unbalanced 3. When Maria, a skydiver instructor, jumps out of the airplane, the acceleration rate of gravity on Maria is 9.8 m/s/s. If the Maria's mass is 100 kilograms, how much force is acting on her? A. 10.2 Newtons B. 98 Newtons C. 980 Newtons D. 9800 Newtons 4. On a different day, Maria jumps out of an airplane. The acceleration rate of the Earth on her is 9.8 m/s/s. However, since she is carrying more equipment today, her mass is now 120 kilograms. When Maria's mass increases, then the amount of force now acting on her will _____. The net force is ____. A. increase, 1176 Newtons down B. increase, 12.1 Newtons down C. decrease, 1176 Newtons down D. decrease, 12.1 Newtons down 5. Newton's Second Law of Motion describes the formula used to calculate the amount of force. What is the correct formula for force? A. Force = Mass/Acceleration B. Force= Acceleration/Mass C. Force= Mass (Acceleration) D. Force= Mass (Distance) 6. A. B. C. D. Which of the following is true about Earth's gravity? Gravity does not act on objects that are at rest or not moving. Gravity only acts on objects that are accelerating. Gravity only acts on objects that are falling down. Gravity acts on all objects on Earth, whether it is at rest or moving. 7. Which object below will have the greatest amount of force? Objects Mass Acceleration Object Mass Object R 5 kg 4 m/s/s Object T 15 kg Object S 10 kg 4 m/s/s Object U 20 kg Acceleration 4 m/s/s 4 m/s/s A. B. C. D. Object R Object S Object T Object U 8. A spring scale (shown on the right) measures the weight of an object. A box is attached to the spring scale. This box is not moving. The force pushing down on the box is called__________and the force pulling up is _____________________. A. spring force, gravity B. gravity, spring force C. gravity, air resistance D. gravity, normal force 9. The weight of the box attached to the spring scale is 30 Newtons down. The box is not moving. What is the magnitude and direction of the net force (cumulative force)? A. 30 N up B. 30 N down C. 0 N, no direction change D. 60 N, no direction change 10. There are three objects with different masses, a yellow, orange, and purple object that will be tested in a vacuum that has no air (no air resistance). If you dropped all three objects from the top of the tower at the same time in a vacuum, which object will hit the ground first? Yellow object = 20 kilograms Orange Object = 40 kilograms Purple object = 80 kilograms A. B. C. D. The yellow object will hit the ground first. The orange object will hit the ground first. The purple object will hit the ground first. All three objects will hit the ground at the same time. 11. Which object, yellow, orange, or purple, has the greatest inertia, greatest resistance to acceleration, and the greatest amount of weight due to Earth's gravity? Yellow object = 20 kilograms Orange Object = 40 kilograms Purple object = 80 kilograms A. B. C. D. yellow orange purple they all have the same amount of inertia, resistance to acceleration, and weight. 12. What factors would affect the acceleration of the object as Earth's gravity is pulling it down? A. air resistance B. mass of the object C. shape of the object D. all of the above. Two students, Dora and Diego, are in a car and on their way to a friend's birthday party. The car is moving to the right, heading east. 13. The force acting to move the car to the right is called the ____________________force. The force acting in the opposite direction is of the car is ______________force. A. B. C. D. friction, applied normal, gravity applied, friction gravity, normal 14. The force acting down on the car is called the _____force. The force acting in the up on the car is ______________force. A. B. C. D. friction, applied normal, gravity applied, friction gravity, normal 15. The driver, Diego, presses on the pedal and the car is moving faster and accelerating in the positive direction. Therefore, net forces are _______________ and the velocity___________. A. B. C. D. balanced, changes unbalanced, changes balanced, stays the same unbalanced, stays the same. 16. The mass of the car is 1, 000 kilograms. If it accelerates at a rate of 5 m/s/s, then the amount of force is ________________. A. 5,000 Newtons B. 1,000 Newtons C. 200 Newtons D. 15, 000 Newtons 17. Which of the following represents the correct formula for acceleration? A. Acceleration= Mass (Force) B. Acceleration= Mass/Force C. Acceleration = Force/Mass D. Acceleration= Mass(Velocity) 18. Which of the following combinations will cause the acceleration rate of an object to increase? A. less force and more mass B. less force and less mass C. more force and more mass D. more force and less mass 19. A car is moving to the right. The force of friction will act to the _______________. Friction is a force that will cause the speed of an object to _____________________. A. right, increase B. left, increase C. right, decrease D. left, decrease Mike has a mass of 50 kilograms (kg). He is wearing roller blades. When he pushes on the wall, the wall pushes back on him. 20. Mike pushes on the wall two times. The first time he pushed, he had a force of 30 Newtons. The second time he pushed, he had a force of 40 Newtons. When Mike pushes on the wall the second time, his acceleration rate was ______than the first time and he will move back a __________distance. A. less, greater B. more, smaller C. more, same D. more, greater 21. Which of Newton's Law states that when Mike pushes on the wall (action force), the wall pushes back on Mike (reaction force). A. Newton's First Law B. Newton's Second Law C. Newton's Third Law D. All of the above 22. With his backpack, Mike’s total mass equals 60 kg. If he pushes on the wall with a force of 120 N, what will be his acceleration rate? A. 7,200 m/s/s B. 720 m/s/s C. 20 m/s/s D. 2 m/s/s 23. Without his backpack, Mike’s total mass equals 50 kg. If he accelerates at a rate of 2 m/s/s, how much force did he use? A. 25 Newtons B. 0.04 Newtons C. 10 Newtons D. 100 Newtons 24. According to Newton's First Law of Motion, unbalanced forces have a net force ____________. Therefore, unbalanced forces will change the _______________of an object. A. equal to 0 Newtons, velocity B. equal to 0 Newtons, distance C. greater than 0 Newtons, time D. greater than 0 Newtons, velocity 25. What would cause Mike to decelerate or have a decrease in his speed? A. less mass on his body B. more applied force C. more friction on the floor D. less friction on the floor Car A and car B have wheels and are on a track. The mass of car A is 16 kilograms and the mass of car B is 8 kilograms. (Note: The arrows below indicate which direction is left and which direction is right). Left Car A Right Car B 26. Car A is not moving. Car B moves towards car A and hits it. Which of the following statements is not true about Newton's Third Law of Motion in this example? A. the action force is car B hits car A and the reaction force is car A hits car B. B. the action force of car B is in the same direction as the reaction force of car A. C. the action force of car B has the same magnitude as the reaction force of car A. D. when car B hits car A, they make contact, and as a result, there is an action and reaction force. 27. Which of the following statements is not true as it relates to Newton's First Law of Motion in this example? A. Car B has more inertia and more resistance to a change in velocity. B. More forces is needed to accelerate car A than car B. C. When car A and car B are not moving, net forces are balanced. D. When car A and car B changes velocity that means that net forces are unbalanced. 28. If Car A and car B move towards each other and collide at the same time. What will happen to each car’s motion right after it bumps into each other? A. Both Car A and car B move to the left B. Both Car A and car B move to the right C. Car A will move to the left and car B will move to the right D. Car A will move to the right and car B will move to the left 29. The mass of car A is twice the mass of car B. If car A and car B collide at the same time, which statement correctly describes the movement of car A? A. Since car A has more mass than car B, it will move back a shorter distance. B. Since car A has more mass than car B, it will accelerate at a greater rate. C. Since car A has more mass than car B, it will move back a greater distance. D. A change in car A’s mass does not affect its acceleration rate or distance. 30. If the mass of Car A is 16 kilograms and the net force is 8 Newtons, then what is its acceleration rate? A. 128 m/s/s B. 2 m/s/s C. 0.5 m/s/s D. 8 m/s/s 31. Which of the following factors will result in more friction between the floor and toy car? A. A smoother surface B. A car with less mass C. A car without wheels D. A surface that is slippery Nathan and Tina are both wearing roller skates. They have been asked to demonstrate Physics concepts for their Physical Science classmates. Use the information to help you answer the question. Note: Nathan has a mass of 48 kilograms and Tina has a mass of 40 kilograms. Left <--------------- -- Nathan Tina ------------------> Right 32. Nathan and Tina both push each other with the same amount of force. They push each other with a force of 144 Newtons. Nathan has a mass of 48 kilograms. What is Nathan's acceleration? A= F/M A= 144 N/48 kg A= 3 m/s/s 33. When Nathan and Tina push each other with a force of 144 Newtons, what will be Tina's acceleration rate? (Note: Tina's mass is 40 kilograms). A= F/M A= 144 N/40 kg A= 3.6 m/s/s 34. When you compare the distance that Nathan and Tina moves after they push each other, _____________ will move a greater distance because he/she has less ________________. A. Nathan, force B. Tina, force C. Nathan, mass D. Tina, mass 35. Which of Newton's Laws best describes the fact that when Nathan pushes Tina, he exerts a force of 144 N to the right on her while she exerts a force of 144 N to the left on him? A. Newton's First Law of Motion B. Newton's Second Law of Motion C. Newton's Third Law of Motion D. All of the above 36. Newton's First Law of Motion states that an object at rest will remain at rest and an object in motion, will continue to stay in motion, unless acted on by ______________________. A. a force B. an unbalanced force C. a balanced force D. a net/cumulative force 37. According to Newton's First Law of Motion, what is the net force of an object that is moving at a constant velocity? A. 0 Newtons B. greater than 0 Newtons C. 10 Newtons D. none of the above 38. According to Newton's Second Law of Motion, the amount of unbalanced force is directly related to what two variables? A. mass and acceleration B. mass and velocity C. speed and time D. velocity and direction 39. Based on the data in the chart, whose scooter had the greatest amount of force? Students mass of scooter (kg) acceleration rate of scooter (m/s/s) Henry 2 4 Victor 2.5 2 Rebecca 3 3 Jazmine 3.5 1 A. B. C. D. Henry Victor Rebecca Jazmine 40. Newton's Third Law of Motion states that for every action, there is an equal but opposite reaction. This means that the pair of forces have _________magnitude and ______direction. A. the same, the same B. the same, opposite C. different, the same D. different, opposite