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Slide 1 / 40 Slide 2 / 40 8th Grade Forces and Motion Study Guide www.njctl.org 1 A snail travels 10 m in 3000 seconds. What is the snail's average speed? A 60000 m/s B 0.02 m/s C 600 m/s D 0.003 m/s Slide 3 / 40 2 2 A 60000 m/s B 0.02 m/s C 600 m/s D 0.003 m/s Answer A snail travels 10 m in 3000 seconds. What is the snail's average speed? D A blimp travels at 3 m/s for 1000 s. What distance does the blimp cover in that time? A 500 m/s B 3000 m C 4500 m/s D 500 m A blimp travels at 3 m/s for 1000 s. What distance does the blimp cover in that time? A 500 m/s B 3000 m C 4500 m/s D 500 m Slide 3 (Answer) / 40 [This object is a pull tab] Answer 1 B [This object is a pull tab] Slide 4 / 40 Slide 4 (Answer) / 40 3 When your teacher times your mile run at 8.2 minutes, that means your speed was 0.12 mi/min. Was this your average speed or your instantaneous speed? Slide 5 / 40 A Average Speed B Instantaneous Speed 3 When your teacher times your mile run at 8.2 minutes, that means your speed was 0.12 mi/min. Was this your average speed or your instantaneous speed? Answer A Average Speed Slide 5 (Answer) / 40 avg speed = B Instantaneous Speed 8.2mi/min [This object is a pull tab] 4 Does a speedometer measure the average speed or the instantaneous speed? A Average Speed B Instantaneous Speed Slide 6 / 40 4 Does a speedometer measure the average speed or the instantaneous speed? Slide 6 (Answer) / 40 B Instantaneous Speed Answer A Average Speed Instantaneous Speed [This object is a pull tab] 5 A swordfish travels for two hours. The first hour he covers 110 kilometers, and the second hour he covers 110 kilometers. What is the average speed of the swordfish? A 55 km/h B 84 km/h C 110 km/h D 194 km/h Hint: Remember that average speed is total distance travelled divided by total time 5 A swordfish travels for two hours. The first hour he covers 110 kilometers, and the second hour he covers 110 kilometers. What is the average speed of the swordfish? 55 km/h B 84 km/h C 110 km/h D 194 km/h Hint: Remember that average speed is total distance travelled divided by total time Answer A Slide 7 / 40 C [This object is a pull tab] Slide 7 (Answer) / 40 6 A dog walks outside to go the bathroom every day. If she walks outside at a speed of 3 meters per second and walks 150 meters before she uses the bathroom, how long does it take her? A 50 seconds B 2 minutes C 188 seconds D 90 seconds A 50 seconds B 2 minutes C 188 seconds D 90 seconds Answer 6 A dog walks outside to go the bathroom every day. If she walks outside at a speed of 3 meters per second and walks 150 meters before she uses the bathroom, how long does it take her? Slide 8 / 40 Slide 8 (Answer) / 40 A [This object is a pull tab] 7 Carlos and Gina are riding on their horses to go into town. They travel 140 meters in 14 seconds going west. What is their velocity? A B C D 490 m/s west 10 m/s west 490 m/s 10 m/s Slide 9 / 40 7 Carlos and Gina are riding on their horses to go into town. They travel 140 meters in 14 seconds going west. What is their velocity? 490 m/s west 10 m/s west 490 m/s 10 m/s Answer A B C D Slide 9 (Answer) / 40 B [This object is a pull tab] 8 A car travels 200 km/h west for 2 hours. The car then travels 150 km/h east for one hour. What is the car's position relative to its starting position? A 50 km west B 150 km west C 250 km west D 50 km east A 50 km west B 150 km west C 250 km west D 50 km east Answer 8 A car travels 200 km/h west for 2 hours. The car then travels 150 km/h east for one hour. What is the car's position relative to its starting position? C [This object is a pull tab] Slide 10 / 40 Slide 10 (Answer) / 40 9 A nitro-methane powered top fuel dragster launches from rest to race against an opponent. Why did the car accelerate? A increased speed B decreased speed C changed direction A nitro-methane powered top fuel dragster launches from rest to race against an opponent. Why did the car accelerate? A increased speed B decreased speed C changed direction Answer 9 Slide 11 / 40 Slide 11 (Answer) / 40 A [This object is a pull tab] 10 A driver hits the brakes to slow down at an intersection. As the car's speed is decreasing it has A positive acceleration B negative acceleration C no acceleration D more information is needed Slide 12 / 40 10 A driver hits the brakes to slow down at an intersection. As the car's speed is decreasing it has Slide 12 (Answer) / 40 A positive acceleration B Answer B negative acceleration C no acceleration [This object is a pull tab] D more information is needed D Time (s) x Y Time (s) Speed (m/s) Time (s) Y Answer C x D Time (s) x Y Speed (m/s) Speed (m/s) Time (s) Slide 13 / 40 x x Which of the following graphs depicts the acceleration of a runner speeding up to pass someone. Y Y B A Speed (m/s) 11 Time (s) Y Speed (m/s) C x Speed (m/s) Time (s) Speed (m/s) Which of the following graphs depicts the acceleration of a runner speeding up to pass someone. Y Y B A Speed (m/s) 11 x C [This object is a pull tab] Time (s) x Slide 13 (Answer) / 40 12 Which of the following speed vs time graphs corresponds to the position vs time graph shown in the graph below? Slide 14 / 40 A B C 12 Which of the following speed vs time graphs corresponds to the position vs time graph shown in the graph below? Slide 14 (Answer) / 40 Answer A A B [This object is a pull tab] C 13 A ball is traveling down a hill at 4 m/s. If the ball increases in speed to 8 m/s in 4 seconds, what is the acceleration of the ball? A 4 m/s B 4 m/s/s C 1 m/s D 1 m/s/s Slide 15 / 40 A 4 m/s B 4 m/s/s C 1 m/s D 1 m/s/s Answer 13 A ball is traveling down a hill at 4 m/s. If the ball increases in speed to 8 m/s in 4 seconds, what is the acceleration of the ball? Slide 15 (Answer) / 40 D [This object is a pull tab] 14 Forces are all around us. Which of the following do you think are examples of forces? (choose all that apply) A Gravity B Friction C Muscles D Wind A Gravity B Friction C Muscles D Wind Answer 14 Forces are all around us. Which of the following do you think are examples of forces? (choose all that apply) A&B [This object is a pull tab] Slide 16 / 40 Slide 16 (Answer) / 40 Slide 17 / 40 15 What is the SI unit for force? A Pounds B Kilograms C Newtons Slide 17 (Answer) / 40 15 What is the SI unit for force? B Kilograms C Newtons Answer A Pounds C [This object is a pull tab] 16 A +20 N force acts on a car and at the same time, a -30 N force acts on the car. What is the net force acting on the car and is it balanced? A -30 N unbalanced B -10 N unbalanced C -10 N balanced D + 30 balanced Slide 18 / 40 A +20 N force acts on a car and at the same time, a -30 N force acts on the car. What is the net force acting on the car and is it balanced? A -30 N unbalanced B -10 N unbalanced C -10 N balanced Answer 16 Slide 18 (Answer) / 40 B [This object is a pull tab] D 17 + 30 balanced The force of gravitation between an object and a planet is increased as they move away from each other: Slide 19 / 40 True False The force of gravitation between an object and a planet is increased as they move away from each other: True False Answer 17 False [This object is a pull tab] Slide 19 (Answer) / 40 18 Slide 20 / 40 A 100 kg kid is on the moon, where g = 1.67 m/s . What is the boy's weight? 2 A 83.5 kg B 167 kg C 167 N D 29.9 N 18 Slide 20 (Answer) / 40 A 100 kg kid is on the moon, where g = 1.67 m/s . What is the boy's weight? 2 A 83.5 kg C 167 N Answer B 167 kg C D 29.9 N [This object is a pull tab] Slide 21 / 40 19 What is the net force acting on the object below? -10 N 7N -8 N Slide 21 (Answer) / 40 19 What is the net force acting on the object below? 7N Answer -10 N -11 N [This object is a pull tab] -8 N Slide 22 / 40 20 Is the object in equilibrium? Yes No -10 N 7N -8 N Slide 22 (Answer) / 40 20 Is the object in equilibrium? Yes No 7N Answer -10 N No [This object is a pull tab] -8 N 21 What is the net force acting on the object below? Slide 23 / 40 -10 N 25 N -15N 21 What is the net force acting on the object below? Slide 23 (Answer) / 40 25 N Answer -10 N 0N [This object is a pull tab] -15N Slide 24 / 40 22 Is the object in equilibrium? Yes No -10 N 25 N -15N Slide 24 (Answer) / 40 22 Is the object in equilibrium? Yes No 25 N Answer -10 N Yes [This object is a pull tab] -15N Slide 25 / 40 23 Acceleration due to gravity on Jupiter is 26.1 m/s2 . How much would a 25 kg person weigh on Jupiter? Slide 25 (Answer) / 40 Answer 23 Acceleration due to gravity on Jupiter is 26.1 m/s2 . How much would a 25 kg person weigh on Jupiter? 653 N [This object is a pull tab] Slide 26 / 40 24 Acceleration due to gravity on Earth's Moon is 1.67 m/s2 . How much would a 113 kg person weigh on Earth's Moon? Slide 26 (Answer) / 40 24 Acceleration due to gravity on Earth's Moon is Answer 1.67 m/s2 . How much would a 113 kg person weigh on Earth's Moon? 189 N [This object is a pull tab] 25 Inertia is the reluctance any material object has to change its state of motion. True False Slide 27 / 40 Inertia is the reluctance any material object has to change its state of motion. True False Answer 25 Slide 27 (Answer) / 40 True [This object is a pull tab] 26 Slide 28 / 40 The law of inertia applies to: A moving objects B nonmoving objects C both moving and nonmoving objects Slide 28 (Answer) / 40 The law of inertia applies to: A moving objects B nonmoving objects C both moving and nonmoving objects Answer 26 C [This object is a pull tab] Slide 29 / 40 27 Which object has the greatest inertia? A Car B Tennis Ball C Freight Train Slide 29 (Answer) / 40 28 A Car B Tennis Ball C Freight Train Answer 27 Which object has the greatest inertia? C [This object is a pull tab] A ball will accelerate and increase its velocity when it feels an unbalanced force. True False Slide 30 / 40 28 A ball will accelerate and increase its velocity when it feels an unbalanced force. Slide 30 (Answer) / 40 False Answer True True [This object is a pull tab] 29 When the force acting on an object decreases, the resulting acceleration will: A remain constant B increase C decrease When the force acting on an object decreases, the resulting acceleration will: A remain constant B increase C decrease Answer 29 C [This object is a pull tab] Slide 31 / 40 Slide 31 (Answer) / 40 30 When an object's mass is decreased but the applied force stays the same, the resulting acceleration will: A remain constant B increase C decrease When an object's mass is decreased but the applied force stays the same, the resulting acceleration will: A remain constant B increase C decrease Answer 30 [This object is a pull tab] force of 40 N and accelerate at a rate of 0.4 m/s2 . What is the total mass of the bicycle and you? 75 kg B 100 kg C 120 kg Slide 32 (Answer) / 40 B 31 You are riding your bicycle to the park to meet a few friends. As you ride, you apply a A Slide 32 / 40 Slide 33 / 40 31 You are riding your bicycle to the park to meet a few friends. As you ride, you apply a Slide 33 (Answer) / 40 Answer force of 40 N and accelerate at a rate of 0.4 m/s2 . What is the total mass of the bicycle and you? 32 A 75 kg B 100 kg C 120 kg B [This object is a pull tab] When you sit on a chair, the chair pushes back with force equal to your weight. Slide 34 / 40 True False When you sit on a chair, the chair pushes back with force equal to your weight. True False Answer 32 True [This object is a pull tab] Slide 34 (Answer) / 40 33 Which of the following statements pertains to the third law of motion? A Action and Reaction pairs always act on the same object. B Mass is indirectly proportional to acceleration. C An object at rest will remain at rest unless acted on by an unbalanced force. D If a force occurs, action reaction forces are present. 33 Which of the following statements pertains to the third law of motion? 34 Action and Reaction pairs always act on the same object. B Mass is indirectly proportional to acceleration. C An object at rest will remain at rest unless acted on by an unbalanced force. D If a force occurs, action reaction forces are present. Answer A Slide 35 / 40 Slide 35 (Answer) / 40 D [This object is a pull tab] How can a small toy have the same momentum as a large car? A toy has large speed B both car and toy are at rest C toy has no mass D A&B Slide 36 / 40 35 35 How can a small toy have the same momentum as a large car? toy has large speed B both car and toy are at rest C toy has no mass D A&B Answer A D If a 3 kg toy truck is moving at 4 m/s, what is the toy's momentum? A 3 m/s B 2 kgm/s C 12 kgm/s D 12 m/s If a 3 kg toy truck is moving at 4 m/s, what is the toy's momentum? A 3 m/s B 2 kgm/s C 12 kgm/s D 12 m/s Slide 36 (Answer) / 40 [This object is a pull tab] Answer 34 C [This object is a pull tab] Slide 37 / 40 Slide 37 (Answer) / 40 36 What two factors does momentum depend on? A mass and volume B mass and acceleration Slide 38 / 40 C mass and velocity D mass and force A mass and volume B mass and acceleration C mass and velocity D mass and force Answer 36 What two factors does momentum depend on? Slide 38 (Answer) / 40 C [This object is a pull tab] 37 The law of conservation of momentum states that the total momentum after a collision increases from its value before the collision. True False Slide 39 / 40 37 The law of conservation of momentum states that the total momentum after a collision increases from its value before the collision. Slide 39 (Answer) / 40 Answer True False False [This object is a pull tab] 38 According to Newton's 3rd law, action reaction pairs are equal and opposite to each other. Why do these paired forces sometimes cause different motions if they are equal? Answer 38 According to Newton's 3rd law, action reaction pairs are equal and opposite to each other. Why do these paired forces sometimes cause different motions if they are equal? because they act on different objects [This object is a pull tab] Slide 40 / 40 Slide 40 (Answer) / 40