Chapter 5-7 Exam Practice

1. Chapter 5-7 Exam Practice By April Senger

2. A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has 2x the mass, what happens to its momentum? • Unchanged • Quadrupled • Doubled • Zero

3. A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has 2x the mass, what happens to its momentum? • Unchanged • Quadrupled • Doubled • Zero

4. When you are in the way of a fast-moving object and can’t get out of its way, you will suffer smaller force of impact if you decrease it momentum over a • Not enough info • Same way either way • Short time • Long time

5. When you are in the way of a fast-moving object and can’t get out of its way, you will suffer smaller force of impact if you decrease it momentum over a • Not enough info • Same way either way • Short time • Long time

6. 2 Billiard balls having the same mass roll toward each other, each moving at the same speed. What is the combined momentum of the 2 balls? • More info is needed • 0 kg x m/s • 10 kg x m/s • 20 kg x m/s

7. 2 Billiard balls having the same mass roll toward each other, each moving at the same speed. What is the combined momentum of the 2 balls? • More info is needed • 0 kg x m/s • 10 kg x m/s • 20 kg x m/s

8. The average momentum of a 70 kg runner who covers 400 m in 50 seconds is • 560 kg x m/s • 5490 kg x m/s • 57 kg x m/s • 8.75 kg x m/s

9. The average momentum of a 70 kg runner who covers 400 m in 50 seconds is • 560 kg x m/s • 5490 kg x m/s • 57 kg x m/s • 8.75 kg x m/s

10. If you push an object twice as far while applying the same force, you do • The same amount of work • Four times as much work • Twice as much work • None of these

11. If you push an object twice as far while applying the same force, you do • The same amount of work • Four times as much work • Twice as much work • None of these

12. If you do work on an object in half the time, your power output is • Twice the power • Four times the power • The same power • Half the usual power

13. If you do work on an object in half the time, your power output is • Twice the power • Four times the power • The same power • Half the usual power

14. Exert 100 J in 50 s and your power output is… • 2 W • 4 W • ½ W • ¼ W

15. Exert 100 J in 50 s and your power output is… • 2 W • 4 W • ½ W • ¼ W

16. An object that has kinetic energy must be • At an elevated position • Moving • Falling • At rest

17. An object that has kinetic energy must be • At an elevated position • Moving • Falling • At rest

18. Which requires more work: lifting a 50 kg sack vertically 2 m or lifting a 25 kg sack vertically 4 m? • Both require the same • Lifting the 25 kg sack • Lifting the 50 kg sack • Not enough info

19. Which requires more work: lifting a 50 kg sack vertically 2 m or lifting a 25 kg sack vertically 4 m? • Both require the same • Lifting the 25 kg sack • Lifting the 50 kg sack • Not enough info

20. A 2 kg mass has 40 J of potential energy with respect to the ground. Approximately how far is it located above the ground? • 2 m • 1 m • 4 m • 3 m

21. A 2 kg mass has 40 J of potential energy with respect to the ground. Approximately how far is it located above the ground? • 2 m • 1 m • 4 m • 3 m

22. What is the product of a force acting over a distance? • Speed • Momentum • Work • Power

23. What is the product of a force acting over a distance? • Speed • Momentum • Work • Power

24. What is the energy that arises from the object’s position (height)? • Momentum • Speed • Potential energy • Kinetic energy

25. What is the energy that arises from the object’s position (height)? • Momentum • Speed • Potential energy • Kinetic energy

26. According to Newton, the greater the masses of interacting objects, the • Less the g force between them • Great the force by two times the mass • Greater the g force between them • None of these

27. According to Newton, the greater the masses of interacting objects, the • Less the g force between them • Great the force by two times the mass • Greater the g force between them • None of these

28. An object is placed exactly halfway between the Earth and the Moon. The object will fall toward the • Moon • Earth • Stay in between them • Float into space

29. Which pulls on the oceans of the Earth with greater force? • The sun • The moon • Both are the same • Not enough info

30. Which pulls on the oceans of the Earth with greater force? • The sun • The moon • Both are the same • Not enough info

31. The best time for digging clams (when the low tide is extra low) is during the time of the • Half moon • New or full moon • Quarter moon • None of these times

32. The best time for digging clams (when the low tide is extra low) is during the time of the • Half moon • New or full moon • Quarter moon • None of these times

33. Tidal forces in general are the result of • Two ore more sources of gravity • A combination of forces acting on a body • Unequal forces acting on different parts of a body • The inverse square law

34. Tidal forces in general are the result of • Two ore more sources of gravity • A combination of forces acting on a body • Unequal forces acting on different parts of a body • The inverse square law

35. Which of the following has the largest momentum relative to Earth? • A Mack truck parked • A dog running on the street • A truck speeding on the highway • A tightrope walker

36. Which of the following has the largest momentum relative to Earth? • A Mack truck parked • A dog running on the street • A truck speeding on the highway • A tightrope walker

37. A cannon recoils from a firing cannonball. The speed of the cannon’s recoil is small because the… • The cannon has more mass • Momentum is small on the cannon • Momentum is mainly on the ball • Force against it is smaller

38. A cannon recoils from a firing cannonball. The speed of the cannon’s recoil is small because the… • The cannon has more mass • Momentum is small on the cannon • Momentum is mainly on the ball • Force against it is smaller

39. Compared with falling on a wooden floor, a wine glass may not break when it falls to a carpeted floor because of the • Longer time to stop • Lesser impulse of stopping • Both of these • Neither of these

40. Compared with falling on a wooden floor, a wine glass may not break when it falls to a carpeted floor because of the • Longer time to stop • Lesser impulse of stopping • Both of these • Neither of these

41. In order to catch a ball, a baseball player extends the hand forward before the impact and then lets it ride backward upon impact. Why does this reduce the force of impact on their hand? • Time of impact is increased • Time of impact is decreased • Relative velocity is less • Force of impact is reduced

42. In order to catch a ball, a baseball player extends the hand forward before the impact and then lets it ride backward upon impact. Why does this reduce the force of impact on their hand? • Time of impact is increased • Time of impact is decreased • Relative velocity is less • Force of impact is reduced

43. A heavy truck & smaller car rolling down a hill at the same speed are forced to stop in the same about of time. Compared to the force that stops the car, the force needed to stop the truck is • Smaller • Greater • The same • Neither

44. A heavy truck & smaller car rolling down a hill at the same speed are forced to stop in the same about of time. Compared to the force that stops the car, the force needed to stop the truck is • Smaller • Greater • The same • Neither

45. Consider driving into a massive concrete wall with no “give” versus having a head-on collision at the same speed with an identical car moving toward you with the same speed. The most damaging would be hitting the • Wall • Car • Both are the same • Neither

46. Consider driving into a massive concrete wall with no “give” versus having a head-on collision at the same speed with an identical car moving toward you with the same speed. The most damaging would be hitting the • Wall • Car • Both are the same • Neither

47. What is the momentum of a 80 kg runner who covers 400 m in 50 seconds? • 640 kg x m/s • 250 kg x m/s • 10 kg x m/s • 8 kg x m/s

48. What is the momentum of a 80 kg runner who covers 400 m in 50 seconds? • 640 kg x m/s • 250 kg x m/s • 10 kg x m/s • 8 kg x m/s

49. A job is done slowly, while an identical job is done quickly, both jobs require the same amount of work but different amounts of… • Power • Energy • Both of these • None of these

50. A job is done slowly, while an identical job is done quickly, both jobs require the same amount of work but different amounts of… • Power • Energy • Both of these • None of these