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[Type text] CAIRO MODERN INTERNATIONAL SCHOOL STUDENT'S NAME: .................................................... STUDENT'S NAME: SCIENCE BOOKLET GRADE .................................................... 6 STUDENT'S NAME: QUARTER 3 .................................................... STUDENT'S NAME: .................................................... SCIENCE DEPARTMENT GRADE 6 QUARTER 3 WORKSHEET UNIT 1 LESSON 1 MULTIPLE CHOICE 1. During a science experiment, a student dropped a metal ball from a height of 150 m. The graph shows the distance the metal ball traveled from its initial position to where it hit the ground. What information does the graph give you about the speed of the metal ball over time? A. B. C. D. The ball travels at a constant speed. The speed of the ball increases over time. The speed of the ball decreases over time. The speed of the ball increases at first, and then decreases as time increases. 2. In a swimming race, Miho swam the first 50 m in 42 s. She swam the second 50 m in 40 s. What was Miho’s average speed during the race? A. B. C. D. 0.82 m/s 1.19 m/s 1.22 m/s 1.25 m/s 2 3. Which unit is used to measure distance? A. B. C. D. Grams Seconds Milliliters Centimeters 4. An athlete is running a 5-km race at an average speed of 8 km/h. She has to stop to tie her shoe. After tying her shoe, she continues running at 8 km/h. Why would her average speed for the entire race be less than 8 km/h? A. The total distance she traveled was longer than 5 km. B. The total distance she traveled was shorter than 5 km. C. The total time she took to complete the race increased because she stopped. D. The total time she took to complete the race decreased because she stopped.. 5. An elevator traveled 15 floors (150 ft) at a speed of 4.5 m/s. What additional information is needed to determine the velocity of the elevator? A. B. C. D. the direction the elevator traveled how long the elevator was stationary how many times the elevator stopped the total mass of the elevator plus anything in it 6. Which of the following is a definition of motion? A. B. C. D. a change in position over time the speed and direction of an object the length of the path between points a location compared to other locations 7.Three runners compete in a 400-m race on an oval-shaped running track. At a certain time, one runner is 15 m behind the finish line. Which term describes the finish line? A. B. C. D. total distance relative motion reference point change in position 3 8. The graph below shows the distance a car traveled in 5 seconds while moving on a freeway. What was the car’s average speed? A. B. C. D. 0 m/s 14 m/s 28 m/s 30 m/s 9. Joanna’s family drove 360 km on a trip. The graph below represents their motion. What was the average speed during the last 3 h of the trip? A. B. C. D. 45 km/h 60 km/h 120 km/h 180 km/h 4 10. A student allowed four different objects to roll down a ramp. He measured the distance each object rolled and the time until each object came to a stop. He plotted each point and connected it with a line from origin of the graph. Which object had the greatest average speed? A. B. C. D. object A object B object C object D 11. Montez read that bobcats can reach speeds of up to 30 mi/h. What does the speed of a bobcat indicate? A. B. C. D. the time it takes to reach its maximum speed the total amount of time it travels in one direction the distance it travels to move between two points the distance it can travel in a certain amount of time 12. Tyrone wants to determine how fast a bowling ball travels when it is bowled. He uses a stopwatch to record, in seconds, the time it takes for the bowling ball to reach the pins. Which unit would be most appropriate to measure the length of the bowling lane? A. B. C. D. meters kilometers millimeters centimeters 5 13. The graph below represents the time and distance traveled by four different toy cars. What was the average speed of car D? A. B. C. D. 0.3 ft/s 2 ft/s 3 ft/s 12 ft/s 14. Which two measurements are needed to determine the speed of an object? A. B. C. D. position and time distance and time position and direction distance and direction 15. Which of the following would best be measured in kilometers? A. B. C. D. the height a golf ball travels into the air the distance a snail moves each second the length between two walls of a room the distance a plane travels during a flight 16. An airplane leaves New York to fly to Los Angeles. It travels 3,850 km in 5.5 hours. What is the average speed of the airplane? A. B. C. D. 700 km 700 hours 700 km/hour 7000 hours/km 6 17. This distance-time graph shows the speeds of four toy cars. Which car is the fastest? A. B. C. D. Car 1 Car 2 Car 3 Car 4 ESSAY 1. What is the difference between the speed of an object, the velocity of an object, and the of an object? ..................................................................................................................................... ..................................................................................................................................... 7 GRADE 6 WORKSHEET UNIT 1 LESSON 2 MULTIPLE CHOICE 1. Rheka conducted an experiment with a radio-controlled toy car. The sketches show her findings. What is the average acceleration of the car? A. B. C. D. 5 m/s2 10 m/s2 15 m/s2 20 m/s2 2. A car travels in a straight line. The driver applies the brakes and comes to an abrupt stop. During braking, what happens to the velocity and acceleration vectors? A. They point in opposite directions. B. They point in the same direction. C. They are at right angles to each other. D. They create centripetal acceleration. 3.What is acceleration? A. B. C. D. the direction of motion the rate at which velocity changes an object’s speed multiplied by its mass the rate at which an object’s position changes 4.Measuring acceleration requires appropriate units. Which are the SI units for acceleration? A. B. C. D. N m/s m/s2 kg·m/s 8 5. Which of the following is an example of acceleration? A. B. C. D. A boat sits on a boat trailer. A car moves in a straight line at 60 km/hr. A plane moves in air at a steady speed of 850 km/hr. A bus moves on a straight road and then makes a right turn. 6. Katrina rode her bicycle to the library. The following graph shows part of Katrina’s ride after she started. What was Katrina’s acceleration during the time represented on the graph? A. B. C. D. The acceleration was zero. The acceleration was 10 m/s. The acceleration was 10 m/s2. The acceleration was 3.3 m/s2. 7. Which of the following is an example of an acceleration vector? A. B. C. D. 5 m/s 5 m/s2 5 m/s2 south 5 m/s south 8. How can you find the average acceleration of an object? A. Multiply its mass by its speed. B. Divide its distance by the time it took to travel that distance. C. Subtract the final position from the initial position and multiply by change in time. D. Subtract the initial velocity from the final velocity and then divide by the change in time. 9 9. Elizabeth is a wildlife biologist. She traveled by boat in the Everglades to observe alligators. The following graphs show the motion of her boat at several times during the trip. Which graph shows her boat traveling when it is not accelerating? A. B. C. D. graph A graph B graph C graph D 10. An experimenter records data for the speed and time of rolling carts traveling along a track. The table shows the data for four trials. Trial 4 Speed (m/s) Trial 3 Speed (m/s) 1 2 8 20 10 9 8 7 Trial 2 Speed (m/s) 4 4 4 4 Trial 1 Speed (m/s) 2 5 10 15 Time (s) 0 1 2 3 In which trial did the cart experience the greatest average acceleration? A. B. C. D. trial 1 trial 2 trial 3 trial 4 11. Which is an example of centripetal acceleration? A. B. C. D. an object at rest an object moving in a circle at 20 m/s an object moving at 20 m/s backward, then 20 m/s to the right an object moving in a straight line at a steady speed of 20 m/s forward 10 12. An experimenter records data for the speed and time of rolling carts. Four different trials were conducted. The table shows the data for all four trials. Trial 4 Speed (m/s) 1 2 8 20 Trial 3 Speed (m/s) 10 9 8 7 Trial 2 Speed (m/s) 4 4 4 4 Trial 1 Speed (m/s) 2 5 10 15 Time (s) 0 1 2 3 In all trials, the cart accelerated. In three of the trials, the cart moved in a straight line. In which trial did the cart experience centripetal acceleration? A. B. C. D. trial 1 trial 2 trial 3 trial 4 13. Which of the following describes an object moving in a circle steadily? A. B. C. D. change in speed only change in direction only no change in speed or direction change in speed and change in direction 14. Which scenario does not describe an example of acceleration? A. B. C. D. A car increases its speed while turning to the left. A car decreases its speed while driving straight ahead. A car maintains a constant speed while turning to the right. A car maintains a constant speed while driving straight ahead 15. Julia is in a car with her father. The car is undergoing centripetal acceleration. What is happening to the car? A. B. C. D. The car is changing direction at a constant speed. The car is changing direction and speeding up. The car is stopping suddenly. The car is slowing down. 11 ESSAY 1. What is the difference between the speed of an object, the velocity of an object, and the acceleration of an object? ............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. ......................................................................................................... ...................................................................................................................................... 12 GRADE 6 WORKSHEET UNIT 1 LESSON 3 MULTIPLE CHOICE 1. Which of the following is considered a contact force? A. B. C. D. the force between two magnets the gravitational pull of a planet friction between an object and air the force between two charged particles 2. Which term describes the tendency of a moving object to continue moving at the same velocity unless an unbalanced force acts on it? A. B. C. D. Inertia Friction Gravity acceleration 3. An index card is placed across the top of a drinking glass. A coin is then placed on top of the index card. A student quickly flicks the card sideways off the glass. Which of the following explains why the coin falls into the glass rather than moving to the side with the index card? A. B. C. D. Newton’s first law of motion Newton’s second law of motion Newton’s third law of motion Newton’s law of universal gravitation 4. Which of the following is an example of a force that acts at a distance? A. B. C. D. An airplane experiences friction as it moves through air. A book experiences a normal force as it rests on a table. A soccer ball experiences a force as it is kicked across a field. A magnet is pushed away when it is brought near the end of another magnet. 13 5. Why is the magnetic force considered to be an action-at-a-distance force? A. B. C. D. Magnets must be far apart in order to exert a force. Magnets do not have to touch each other to experience a force. Magnets push each other apart to increase the distance between them. Magnets must be large in size in order to exert a force that is strong enough to notice. 6.Why is the friction force considered to be a contact force? A. B. C. D. Friction affects only solid objects. Friction always acts in the same direction. Friction is produced when objects slide past one another. Friction acts in a direction opposite to the direction of an object’s motion. 7. A box of books is on the floor. The following picture shows a push and a pull acting on the box. What is the net force toward the right on the box? A. B. C. D. 0N 50 N 100 N 2,500 N 8.Jessica has two balls. One ball has a mass of 1 kg. The other ball has a mass of 2 kg. She pushes each with a force of 100 N. How does the acceleration of the two balls compare? A. B. C. D. The 1-kg ball accelerates the same as the 2-kg ball. The 1-kg ball accelerates half as much as the 2-kg ball. The 1-kg ball accelerates twice as much as the 2-kg ball. The 1-kg ball accelerates four times as much as the 2-kg ball. 14 9. During a baseball game, a hitter strikes the ball with a bat. When this happens, the ball and the bat exert a force on each other. Why does the ball accelerate away from the bat more than the bat accelerates away from the ball? A. The ball has less mass, so it exerts less force on the bat. B. The ball has greater velocity before the collision, so the force affects the ball more than it affects the bat. C. The bat exerts more force than the ball because the batter is exerting a force on the bat as it hits the ball. D. The ball has less mass, so the equal force on the ball and the bat causes greater acceleration of the ball. 10.The diagram below shows the forces acting on a sneaker. As the force F is applied, the sneaker does not move. Which statement below correctly describes the forces? A. B. C. D. The net force is acting in an upward direction. The net force is acting to the left. The net force is moving to the right. The net force is zero and all the forces are balanced. 11. Consider two objects whose masses are 100 g and 200 g. The smaller object strikes the larger object with a force of 500 N. According to Newton’s third law of motion, what force does the larger object exert on the smaller object? A. B. C. D. 250 N 500 N 1,000 N 1,500 N 15 12.Imagine a box floating in space. The following picture shows all the forces acting on this box. What is the vertical force on this box? A. B. C. D. 50 N upward 100 N upward 50 N downward 100 N downward 13.A moving object collides with a stationary object. Which of the following statements is true according to Newton’s third law of motion? A. Each object exerts a force on the other, and the two forces are equal and in opposite directions. B. Each object exerts a force on the other, and the two forces are the same in magnitude and direction. C. Each object exerts a force on the other, and the two forces are proportional to the masses of the objects. D. The moving object exerts a force on the stationary object, but the stationary object does not exert a force on the moving object. 14. A soccer player kicks a ball. According to Newton’s third law of motion, the player’s foot exerts a force on the ball. The ball exerts a force on the foot. Why don’t the forces cancel out to result in a net force of zero? A. B. C. D. The ball moves before the forces can cancel out. The forces become unbalanced due to air resistance. The force on the ball is greater than the force on the foot. The forces are exerted on different objects so they are not balanced forces. 16 15. Two equal forces act in opposite directions on object A. Two unequal forces act in opposite directions on object B. If these are the only forces acting on objects A and B, which of the following conclusions is true? A. B. C. D. Only object A will accelerate. Only object B will accelerate. Both object A and object B will accelerate. Neither object A nor object B will accelerate. SHORT ANSWER 1. Marek is trying to push a box of sports equipment across the floor. The arrow on the box is a vector representing the force that Marek exerts. What are the forces acting upon the box? 2. What does the formula F = ma mean, and which of Newton’s three laws does it describe? ESSAY 1. The following diagram shows the forces acting on a box. 17 Explain how you calculate the net force in any direction on the box. ___________________________________________________ ___________________________________________________ Suppose an upward force of 15 N is added to the box. What will be the net vertical force on the box? ___________________________________________________ ___________________________________________________ What force could be applied to the box to make the net force in the horizontal direction zero? Explain. ___________________________________________________ ___________________________________________________ Suppose a force of 25 N to the right is added to the box. What will be the net force to the right? ___________________________________________________ ____________________________________________________ 2. The following diagram shows the forces acting on a box. What do the length and the direction of the arrows in the diagram represent? ___________________________________________________ 18 Are any of the forces acting on the box balanced? How do you know? ___________________________________________________ ___________________________________________________ Are any of the forces acting on the box unbalanced? How do you know? ___________________________________________________ ___________________________________________________ Describe the motion of the box as a result of the forces acting on it. ___________________________________________________ ___________________________________________________ 19 GRADE 6 WORKSHEET UNIT 2 LESSON 1 MULTIPLE CHOICE 1.A boy is riding a skateboard. Why does the skateboard have the ability to do work? A. because it can slow down B. because it can change direction C. because the force applied by the rider acts in the same direction as the motion of the skateboard D. because the force applied by the rider acts in the opposite direction as the motion of the skateboard 2. Consider the following two situations: 1. A girl kicks a ball across a field. 2. A boy holds a suitcase by his side. Which of the following responses is correct about the two situations? A. B. C. D. Work is done is both situations. No work is done in either situation. Work is done in the first situation, but not the second. Work is done in the second situation, but not the first. 3. The table shows different forces and distances that employees in a factory used to lift boxes. Distance (m) 1.5 2.5 1.0 Force (N) 24 18 25 Ayanna Rafael Cassie 2.0 16 Michael Employee Which employee did the most work while lifting boxes? A. B. C. D. Cassie Rafael Ayanna Michael 20 4. Which of the following best defines energy? A. B. C. D. the ability to do work the resistance to motion how fast an object moves amount of force in a given time 5. Which of the following describes a transfer of energy through work? A. B. C. D. A student carries a heavy backpack one km. A laboratory burner is used to heat 250 mL of water to boiling. A woman pushes a luggage cart in an airport over a distance of 100 m. A man pushes on a large piece of furniture for 15 min, but it does not move. 6. A lightbulb uses 2,000 J of energy in 1 min and 20 s. What is the power of the lightbulb? A. B. C. D. 25 W 50 W 60 W 100 W 7. Which of the following is an example of energy being used to do work? A. B. C. D. A woman sits on the edge of a bench. A soccer ball rests at the top of a hill. A boy holds a fishing pole over the water. A girl climbs up a ladder holding a paint can. 8. The table shows different forces and distances that employees in a factory used to lift boxes. Distance (m) 1.5 2.5 1.0 2.0 Force (N) 24 18 25 16 Employee Ayanna Rafael Cassie Michael Which employee did the least work while lifting boxes? A. B. C. D. Cassie Rafael Ayanna Michael 21 9. Dr. Hernandez and Dr. Osman measure the power of a new type of lightbulb. Both researchers find the energy measurement as 90 J for a time of 30 s. However, Dr. Hernandez determines that the power is 3 J/s, and Dr. Osman says that the power is 2700 J/s. Why do the results differ? A. Dr. Osman has an incorrect numerical value but a correct unit. B. Dr. Hernandez has the correct numerical value but an incorrect unit. C. The units are correct for Dr. Osman’s results but Dr. Hernandez divided the units instead of multiplying them. D. The units are correct for Dr. Hernandez’s results but Dr. Osman multiplied the units instead of dividing them. 10. A group of wind turbines operates in an open field. Which statement about the wind turbines is true? A. B. C. D. The wind turbines produce movement of air that does work. The wind turbines do work by using electricity to produce power. The wind turbines cannot do work because they are fixed in one spot. The wind turbines do work generating electricity by harnessing wind energy. 11. A student is planning a camping trip and wants to take a few electronic devices along. Her flexible portable solar panel converts electromagnetic energy from the sun into electrical energy at a rate of 21,600 J/h. Which devices could she charge with it at one time? Power Needed 2W 5W 7W A. B. C. D. Device Cell phone charger PDA charger AA/AAA battery charger all three devices the AA/AAA battery charger both the cell phone charger and the PDA charger together the PDA charger or the cell phone charger separately, but not both together 22 12.A baseball player used energy to hit a ball out of the park. What is true about what took place? A. B. C. D. The ball lost energy when it was struck by the bat. Force was applied in a different direction than motion. Work was done on the ball through the transfer of energy. No power was used because the action happened so quickly. 13. Four movers pushed different boxes across a floor for the same distance. The table shows how much force each mover used, the time it took to move the box, and the mass of the box. Mass of Box (kg) 15 15 18 22 Time (s) 5 10 3 10 Force (N) 155 120 90 160 Mover Akira Maddie Jayden Hamid Which mover did the most work moving a box? A. B. C. D. Akira Hamid Jayden Maddie 14. Four movers pushed different boxes across a floor for the same distance. The table shows how much force each mover used, the time it took to move the box, and the mass of the box. Mass of Box Time Force Mover (kg) (s) (N) 15 5 155 Akira 15 10 120 Maddie 18 3 90 Jayden 22 10 160 Hamid Which mover did the least work moving a box? A. B. C. D. Akira Hamid Jayden Maddie 23 15. A girl uses 60 J of energy to move a box from the floor to a shelf. How much power does she use if it takes her 3 s to move the box? A. B. C. D. 15 W 20 W 90 W 180 W 16. A girl uses 60 J of energy to move a box from the floor to a shelf. If she uses 20 W of power to move the box, how many seconds did it take her to move the box? A. B. C. D. 2 3 30 120 17. Energy is the ability to do work. In which of these examples does using energy cause work to be done? A. B. C. D. A girl kicks a ball across a field. A boy holds a suitcase by his side. A pitcher holds a ball in his glove. A woman reads instructions for assembling her bicycle. SHORT ANSWER 1. Work is defined as the use of force to move an object in the direction of that force and is equal to the force times the distance the object moved. How do energy and power relate to work? ............................................................................................................................................. ESSAY 1. Energy can be used to do work using many processes. Complete the chart by identifying the energy conversion or conversions that take place for each example given. The first example is done for you. 24 Energy conversion(s) Chemical energy from food is converted to mechanical energy you can use to do work. Example You get energy when you eat and digest food. Energy from a battery powers a flashlight. Energy from water behind a dam lights a home. Differences in temperatures cause wind. A drum set causes dishes to rattle. OTHER 1. ________________________ is the use of force to move an object in the direction of the force. 25 Science department Final revision sheet grade 6 Quarter 3 Motion and Forces Fill in each blank with the term that best completes the following sentences. 1. The ________________________ of an object describes the speed and the direction in which it is going. 2. The change in the velocity of an object is defined as its ________________________. 3. An object that is traveling around another body in space is in ________________________ around that body. 4. The ________________________ on an object is the combination of all the forces acting on the object. Key Concepts Read each question below, and circle the best answer. 5. An airplane leaves New York to fly to Los Angeles. It travels 3,850 km in 5.5 hours. What is the average speed of the airplane? A. 700 km C. 700 km/hour B. 700 hours D. 700 hours/km 6. This distance-time graph shows the speeds of four toy cars. Which car is the fastest? A. Car 1 C. Car 3 B. Car 2 D. Car 4 26 7. The diagram below shows the forces acting on a sneaker. As the force F is applied, the sneaker does not move. Which statement below correctly describes the forces? A. The net force is acting in an upward direction. B. The net force is acting to the left. C. The net force is moving to the right. D. The net force is zero and all the forces are balanced. 8. Julia is in a car with her father. The car is undergoing centripetal acceleration. What is happening to the car? A. The car is changing direction at a constant speed. B. The car is changing direction and speeding up. C. The car is stopping suddenly. D. The car is slowing down. Critical Thin king Answer the following questions in the space provided. 9. Marek is trying to push a box of sports equipment across the floor. The arrow on the box is a vector representing the force that Marek exerts. What are the forces acting upon the box? ___________________________________________________________________________________ ___________________________________________________________________________________ 27 ___________________________________________________________________________________ 10. What does the formula F = ma mean, and which of Newton’s three laws does it describe? ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ Answer the following question in the space provided. 11. What is the difference between the speed of an object, the velocity of an object, and the acceleration of an object? ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 28