Forces and Motion Study Guide
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1 Forces and Motion Study Guide Name 8 th Grade PSI 1. A snail travels 10 m in 3000 seconds. What is the snail s average speed? a m/s b m/s c. 600 m/s d m/s 2. A blimp travels at 3 m/s for 1000 s. What distance does the blimp cover in that time? a. 500 m/s b m c m/s d. 500 m 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 4. Does a speedometer measure the average speed or the instantaneous speed? a. Average Speed b. Instantaneous Speed 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
2 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 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. 490 m/s west b. 10 m/s west c. 490 m/s d. 10 m/s 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 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 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
3 11. Which of the following graphs depicts the acceleration of a runner speeding up to pass someone.
4 12. Which of the following speed vs time graphs corresponds to the position vs time graph shown in the graph below? 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 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
5 15. What is the SI unit for force? a. Pounds b. Kilograms c. Newtons 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 N balanced 17. The force of gravitation between an object and a planet is increased as they move away from each other: 18. A 100 kg kid is on the moon, where g = 1.67 m/s2. What is the boy's weight? a kg b. 167 kg c. 167 N d N 19. What is the net force acting on the object below? -10 N 7 N -8 N 20. Is the object in number 19 in equilibrium?
6 21. What is the net force acting on the object below? -10 N 25 N -15N 22. Is the object in number 21 in equilibrium? 23. Acceleration due to gravity on Jupiter is 26.1 m/s 2. How much would a 25 kg person weigh on Jupiter? 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? 25. Inertia is the reluctance any material object has to change its state of motion. 26. The law of inertia applies to: a. moving objects b. nonmoving objects c. both moving and nonmoving objects 27. Which object has the greatest inertia? a. Car b. Tennis Ball c. Freight Train
7 28. A ball will accelerate and increase its velocity when it feels an unbalanced force. 29. When the force acting on an object decreases, the resulting acceleration will: a. remain constant b. increase c. decrease 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 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 32. When you sit on a chair, the chair pushes back with force equal to your weight. 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. 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
8 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 kg m/s c. 12 kg m/s d. 12 m/s 36. What two factors does momentum depend on? a. mass and volume b. mass and acceleration c. mass and velocity d. mass and force 37. The law of conservation of momentum states that the total momentum after a collision increases from its value before the collision. 38. According to Newton s 3 rd 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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