Slide 1 / 40 Slide 2 / 40 8th Grade Forces and Motion Study Guide www.njctl.org Slide 3 / 40 1 A snail travels 10 m in 3000 seconds. What is the snail's average speed? 60000 m/s A 0.02 m/s B 600 m/s C 0.003 m/s D
Slide 4 / 40 2 A blimp travels at 3 m/s for 1000 s. What distance does the blimp cover in that time? 500 m/s A 3000 m B 4500 m/s C 500 m D Slide 5 / 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? A Average Speed B Instantaneous Speed Slide 6 / 40 4 Does a speedometer measure the average speed or the instantaneous speed? A Average Speed B Instantaneous Speed
Slide 7 / 40 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? Hint: Remember 55 km/h A that average speed 84 km/h is total distance B travelled divided by 110 km/h C total time 194 km/h D Slide 8 / 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? 50 seconds A 2 minutes B 188 seconds C 90 seconds D 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 A 10 m/s west B 490 m/s C 10 m/s D
Slide 10 / 40 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? 50 km west A 150 km west B 250 km west C 50 km east D Slide 11 / 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 Slide 12 / 40 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 13 / 40 11 Which of the following graphs depicts the acceleration of a runner speeding up to pass someone. Y B Y A Speed (m/s) Speed (m/s) x x Time (s) Time (s) Y Y C Speed (m/s) D Speed (m/s) x x Time (s) Time (s) Slide 14 / 40 12 Which of the following speed vs time graphs corresponds to the position vs time graph shown in the graph below? A B C Slide 15 / 40 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 16 / 40 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 Slide 17 / 40 15 What is the SI unit for force? A Pounds B Kilograms C Newtons Slide 18 / 40 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 19 / 40 17 The force of gravitation between an object and a planet is increased as they move away from each other: True False Slide 20 / 40 18 A 100 kg kid is on the moon, where g = 1.67 m/s 2 . What is the boy's weight? A 83.5 kg B 167 kg C 167 N D 29.9 N Slide 21 / 40 19 What is the net force acting on the object below? -10 N 7 N -8 N
Slide 22 / 40 20 Is the object in equilibrium? Yes No -10 N 7 N -8 N Slide 23 / 40 21 What is the net force acting on the object below? -10 N 25 N -15N Slide 24 / 40 22 Is the object in equilibrium? Yes No -10 N 25 N -15N
Slide 25 / 40 23 Acceleration due to gravity on Jupiter is 26.1 m/s 2 . How much would a 25 kg person weigh on Jupiter? Slide 26 / 40 24 Acceleration due to gravity on Earth's Moon is 1.67 m/s 2 . How much would a 113 kg person weigh on Earth's Moon? Slide 27 / 40 25 Inertia is the reluctance any material object has to change its state of motion. True False
Slide 28 / 40 26 The law of inertia applies to: A moving objects B nonmoving objects C both moving and nonmoving objects Slide 29 / 40 27 Which object has the greatest inertia? A Car B Tennis Ball C Freight Train Slide 30 / 40 28 A ball will accelerate and increase its velocity when it feels an unbalanced force. True False
Slide 31 / 40 29 When the force acting on an object decreases, the resulting acceleration will: A remain constant B increase C decrease Slide 32 / 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 Slide 33 / 40 31 You are riding your bicycle to the park to meet a few friends. As you ride, you apply a force of 40 N and accelerate at a rate of 0.4 m/s 2 . What is the total mass of the bicycle and you? A 75 kg B 100 kg C 120 kg
Slide 34 / 40 32 When you sit on a chair, the chair pushes back with force equal to your weight. True False Slide 35 / 40 33 Which of the following statements pertains to the third law of motion? Action and Reaction pairs always act on A the same object. B Mass is indirectly proportional to acceleration. An object at rest will remain at rest unless C acted on by an unbalanced force. If a force occurs, action reaction forces are D present. Slide 36 / 40 34 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 37 / 40 35 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 38 / 40 36 What two factors does momentum depend on? A mass and volume B mass and acceleration C mass and velocity D mass and force 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. True False
Slide 40 / 40 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?
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