Name Period Chapter 10 Study Guide

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1 Name _ Period Chapter 10 Study Guide Modified True/False Indicate whether the statement is true or false. 1. Unbalanced forces do not change an object s motion. 2. Friction depends on the types of surfaces involved and how hard the surfaces push together. 3. When the only force acting on a falling object is air resistance, the object is said to be in free fall. 4. The property of matter that resists a change in motion is called inertia. 5. According to Newton s second law of motion, weight depends on an object s mass and the net force acting on the object. 6. Newton s third law of motion states that for every action there is an equal but opposite unbalanced force. Use the diagram to answer each question. Assume that all of the objects in the diagram are solid and made of the same material. Arrows represent gravitational force. 7. In Set A, is the gravitational force greater between the objects in pair 1 or pair 2? A. Pair 2 B. Pair 1 8. In Set A, what would you have to do to the objects to make the gravitational forces between the objects in pair 2 the same as the forces between the objects in pair 1? A. Move pair 2 farther apart B. Move the objects in pair 1 closer together C. Both A and B D. None of the above 9. In Set B, explain the difference in the magnitudes of the gravitational forces between the two pairs of objects. A. The gravitaional forces between the objects in pair 1 are greater than pair 2. B. The gravitaional forces between the objects in pair 2 are greater than pair

2 Multiple Choice Identify the choice that best completes the statement or answers the question. 10. Forces can be added together only if they are a. acting on the same object. b. balanced forces. c. unaffected by gravity. d. substantial. 11. In physical science, a push or a pull is called a(n) a. acceleration. b. force. c. inertia. d. motion. 12. What happens when two forces act in the same direction? a. They cancel each other out. b. The stronger one prevails. c. They add together. d. Their sum divided by two is the total force. 13. Balanced forces acting on an object a. always change the object s motion. b. sometimes change the object s motion. c. never change the object s motion. d. are not related to motion. 14. The force that one surface exerts on another when the two rub against each other is called a. gravity. b. acceleration. c. inertia. d. friction. 15. Which of the following is an example of rolling friction? a. your shoes on a sidewalk as you walk b. bike tires on the road as you ride c. a boat on the water as it sails d. two hands rubbing together 16. Which of the following is an example of increasing friction intentionally? a. waxing skis b. adding grease to gears on a bike c. oiling a squeaky door d. throwing sand on an icy driveway 17. The force of gravity on a person or object on the surface of a planet is called a. weight.. b. air resistance. c. mass. d. free fall. 18. The law of universal gravitation states that any two objects in the universe, without exception, a. attract each other. b. repel each other. c. combine to provide a balanced force. d. create friction.

3 19. The amount of matter in an object is called its a. inertia. b. mass. c. force. d. balance. 20. The force that pulls falling objects toward Earth is called a. free fall b. gravity c. acceleration. d. air resistance. 21. When the only force acting on a falling object is gravity, the object is said to be a. stationary. b. decelerating. c. in free fall. d. a projectile. 22. Air resistance is a type of a. motion. b. acceleration. c. velocity. d. friction. 23. Objects falling through air experience a type of friction called a. terminal velocity. b. inertia. c. air resistance. d. rolling friction. 24. The tendency of an object to resist change in its motion is known as a. mass. b. inertia. c. force. d. balance. 25. The greater the mass of an object, a. the easier the object starts moving. b. the greater its inertia. c. the more balanced it is. d. the more space it takes up. 26. According to Newton s third law of motion, when a hammer strikes and exerts force on a nail, the nail a. creates a friction with the hammer. b. disappears into the wood. c. exerts an equal force back on the hammer. d. moves at a constant speed. 27. The product of an object s mass and velocity is called its a. inertia. b. force. c. acceleration. d. momentum.

4 28. How can you increase the momentum of an object? a. by decreasing its velocity b. by increasing its mass c. by increasing its friction d. by decreasing its acceleration 29. The total momentum of a group of objects is conserved unless a. outside forces do not act on the objects. b. outside forces act on the objects. c. the objects are moving. d. there are more than two objects. 30. The achievement of lifting a rocket off the ground and into space can be explained by a. Newton s first law. b. Newton s second law. c. Newton s third law. d. the law of conservation of momentum. 31. Any force that causes an object to move in a circle is called a(n) a. centripetal force. b. unbalanced force. c. gravitational force. d. balanced force. 32. How does the momentum of a 4.0-kg bowling ball rolling at 3.0 m/s compare to the momentum of a 6.0-kg bowling ball rolling at 2.0 m/s? a. The bowling balls have equal momentum. b. The 4.0-kg bowling ball has more momentum. c. The 6.0-kg bowling ball has more momentum. d. There is not enough information to compare the two bowling balls. Completion Complete each statement using the words below: net elastic velocity satellite fluid upward increases opposite equal to mass inertia air resistance gravity SPELLING COUNTS!!!! 33. The overall force on an object after all the forces are added together is called the force. 34. Unbalanced forces acting on an object produce a change in the object s. 35. Wet pavement is more slippery than dry pavement because the force needed to overcome friction is less than the force needed to overcome sliding friction. 36 As the distance between two objects decreases, the gravitational force between them. 37. The downward force acting on an object in free fall is the force of. 38. When equals the force of gravity on a falling object, the object reaches terminal velocity. 39. A measure of an object s is a measure of the object s inertia. 40. A person traveling in a car that stops suddenly keeps moving forward due to.

5 41. According to Newton s third law of motion, the strength of a reaction force is the strength of the action force. 42. If the action force of a bat striking a ball accelerates the ball in one direction, the reaction force accelerates the bat in the direction. 43. During lift-off, the thrust on a rocket is directed. 44. Because the moon travels around Earth, it is a(n). 45. Matter is considered if it returns to its original shape after it is squeezed or stretched. Use the diagram to answer each question. 46. What does the head of each arrow indicate? A. The direction the ball is going to move. B. The direction of the force C. The strength of the force D. None of the above 47. What does the length of each arrow represent? A. The magnitiude of the force B. The direction of the force C. None of the above 48. In what direction is the net force acting on the 1-kg object? A. Up B. To the right C. To the left D. None of the above 49. In what direction must a third force be applied to the 1-kg object so that the forces on it are balanced? A. Up B. To the right C. To the left D. None of the above 50. Compare the acceleration of the 1-kg object with that of the 2-kg object. A. The 1 kg object is twice the acceleration of the 2 kg object. B. The 1 kg object is 3 times the acceleration of the 2 kg object. C. The 2 kg object has no acceleration. D. None of the above PLUS there will be 8 word problems where you will need to solve for average speed, force, acceleration and momentum. Formulas WILL BE PROVIDED.

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