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1 1. The SI unit for speed is A. Miles per hour B. meters per second 5. Frictional forces are greatest when both surfaces are rough. A. true B. false 2. The combination of all of the forces acting on an object is called the A. net force B. total force 6. An object is in motion when A. the object changes position relative to a stationary reference point. B. you observe the object move. 3. If the net force acting on a stationary object is zero, then the object will A. Accelerate B. remain at rest 7. An object that changes position relative to a reference point is A. stationary B. in motion 4. If the net force on an object is zero then the object has 8. Average speed can be represented by the mathematical expression A. balanced forces B. unbalanced forces A. distance/time B. distance x time

2 9. The of an object consists of its speed and direction. A. displacement B. velocity 13. What happens when a car slows down and velocity changes? A. positive acceleration B. negative acceleration 10. Displacement must always indicate 14. Net force is A. direction B. speed A. the combination of all the forces acting on an object. B. the force of gravity pulling the object down. 11. Speeding up, slowing down, and changing direction is best described as A. velocity B. acceleration 15. An object experiencing balanced forces A. is speeding up B. has a net force of zero 12. When centripetal acceleration occurs, an object A. changes direction B. slows down 16. A game of tug-of-war with a winner is an example of A. balanced forces B. unbalanced forces

3 17. In order to increase a car s speed, the force pushing it forward must be A. rolling friction B. kinetic friction 21. Friction is defined as the A. rate at which velocity changes B. force that opposes motion 18. The distance traveled by an object divided by the time it takes to travel that distance is called A. average speed B. average velocity 22. An object is in motion when A. the object changes position relative to a frame of reference B. friction occurs 19. The difference between speed and velocity is that velocity includes A. distance B. direction 23. Force is a quantity made up of A. weight and speed B. magnitude and direction 20. An example of helpful friction is A. writing on paper with a pen B. car tires wearing out 24. Acceleration is defined as the change in velocity divided by A. time B. distance

4 25. In order to determine speed, you must know A. only distance B. both time and distance 29. The law that states that the unbalanced force acting on an object equals the object s mass times its acceleration is A. Newton s 2 nd law 26. Of the following, the greatest gravitational force would occur between 30. What is the unbalanced force that slows down a ball rolling across the floor? A. the moon and Earth B. a marble and a baseball A. friction B. gravity 27. The law that states that every object maintains constant velocity unless acted on by an unbalanced force is A. Newton s 1 st law 31. If two objects with different masses and traveling with different velocities collide, what law allows you to predict the motion of the objects after the collision? A. the law of conservation of momentum B. the law of universal gravitation 28. The law that states that for every action force there is an equal and opposite reaction force is A. Newton s 1 st law 32. A stone will not move unless something pushes or pulls it. A. Newton s 1 st law

5 33. Which object has the greatest inertia? A. tennis ball B. bowling ball 37. Which statement about weight is incorrect/ A. An object weighs more on the moon than it weighs on Earth. B. A change in an object s location can change the object s weight. 34. What force causes a skater sliding on the ice to gradually slow down? A. friction B. inertia 38. An object s momentum is determined by the object s A. weight and velocity. B. mass and velocity. 35. Which of the following objects exerts a the largest gravitational force? A. a feather B. a book 39. Which of the following has a momentum of zero? A. newspaper lying on a table B. a leaf falling to the ground 36. Increasing which of these conditions results in more gravitational force between two objects? A. mass B. distance 40. The SI unit of force, named after the scientist who described the relationship between motion and force, is called the A. newton B. curie

6 41. When air resistance balances the weight of a falling object, the velocity A. rapidly increases. B. remains constant. 45. Whenever an object is standing still, which value is always zero? A. momentum B. inertia 42. The weight of an object can be calculated by multiplying mass by A. speed. B. free-fall acceleration. 46. A tug-of-war that results in one team pulling the other across the line is an example of A. unbalanced forces. B. balanced forces 43. Which object does not have momentum? A. a fish swimming in a pond B. a rock by the side of the road 47. Weight is best described as A. the downward force exerted on an object due to gravity. B. a force solely dependent on an object s mass. 44. What is the reaction force when you place a cup on a table? A. the force of the table on the cup B. the force of gravity on the cup 48. Which of the following units is used to measure acceleration? A. m/s B. m/s 2

7 49. The tendency of an object at rest to remain at rest is A. inertia. B. free fall. 50. Near Earth s surface, the strongest gravitational force would occur between an elephant and A. the moon. b. Earth.

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