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2. Describes the speed of an object in a specific direction.

3. VELOCITY

4. Tendency of an object at rest to stay at rest, and an object in motion to stay in motion.

5. INERTIA

6. Velocity is increasing. (____ acceleration)

7. POSITIVE ACCELERATION

8. When one object exerts a force on a second object, the second object will exert an equal but opposite force on the first object. (Newton’s ____ Law)

9. NEWTON’S 3 rd LAW

10. Velocity is decreasing. ( ____ acceleration)

11. NEGATIVE ACCELERATION

12. How much work is done using a force of 12 newtons to move a 14-kg box a distance of 7 meters?

13. 84 JOULES

14. In order for work to be done, the object must ______________.

15. MOVE IN THE DIRECTION OF THE APPLIED FORCE.

16. Natural energy resource that cannot be replaced as quickly as it is used.

17. Nonrenewable resource

18. Process in which waves interact with each other.

19. Interference

20. Grooved wheel that rotates with a rope or cable around it.

21. Pulley

22. The transfer of thermal energy between objects at different temperatures.

23. Heat

24. Number of wavelengths that pass by a certain point in a given time.

25. Frequency

26. Transfer of heat in fluids by the movement of particles in the fluids.

27. Convection

28. Coal, petroleum and natural gas are examples of this type of fuel.

29. Fossil fuel

30. Distance from one crest or trough to the matching point on the next crest or trough.

31. Wavelength

32. Occurs when two objects naturally vibrate at the same frequency.

33. Resonance

34. Total kinetic energy of all the particles that make up a sample of matter.

35. Thermal energy

36. Ratio of work output (W O ) to work input (W I ) x 100.

37. Efficiency

38. Energy resource that is replaced as quickly as it is used.

39. Renewable resource

40. Energy due to the motion of an object.

41. Kinetic energy

42. Simple machine made up of a wheel that turns on an axle.

43. Wheel and axle

44. Work done by a machine.

45. Output work

46. Occurs when light rays strike a smooth surface.

47. Reflection

48. Transfer of heat by the motion of waves. Does not require contact between objects.

49. Radiation

50. Ability to do work.

51. Energy