1. diagram 1

2. a plan, sketch, drawing, or outline made to show how something works or to show the way parts are put together 2

3. force 3

4. a push or a pull that causes an object to move, stop, or change direction 4

5. gravity 5

6. the force that pulls all things in the universe toward each other; the force that pulls things down on Earth 6

7. magnetism 7

8. a force that pulls iron or steel across a distance; a force that attracts or repels magnetic material 8

9. friction 9

10. a force that resists motion when objects rub against each other 10

11. motion 11

12. a change in the position of an object 12

13. Simple machine 13

14. a device with few or no moving parts that changes the size or direction of a force 14

15. energy 15

16. the ability to make a change in matter 16

17. electricity 17

18. energy that flows through a circuit and can create light, heat, magnetism, sound, or other effects 18

19. Electric circuit 19

20. a closed path where electricity can flow 20

21. electromagnet 21

22. a temporary magnet created when electricity passes through wire wrapped around an iron bar 22

23. Thermal energy 23

24. heat energy caused by the movement of molecules in an object 24

25. conduction 25

26. the direct transfer of heat between objects that touch 26

27. convection 27

28. heat moving from one object to another caused by mixing a liquid or a gas 28

29. radiation 29

30. the movement of thermal (heat) energy by electromagnetic waves, such as light waves from the sun 30

31. Sound energy 31

32. a change in matter made by vibrating objects 32

33. vibrate 33

34. to move back and forth 34

35. pitch 35

36. how high or low a sound is

37. Volume (in relation to sound) 37

38. the loudness or amount of a sound 38

39. conductor 39

40. a material that allows energy to flow through it easily 40

41. Insulator 41

42. a material that does not allow energy to flow through it easily 42

43. Light energy 43

44. a form of energy that travels in waves and can be seen with our eyes 44

45. reflect 45

46. when light rays bounce off an object 46

47. refract 47

48. when light rays bend 48

49. absorb 49

50. to take in and hold inside 50

51. Fossil fuels 51

52. materials formed from decayed remains of ancient plants and animals that are burned to produce heat; coal, oil, and natural gas 52

53. Solar energy 53

54. energy from sunlight 54

55. Mechanical energy 55

56. energy of motion 56

57. Potential energy 57

58. energy that is stored in a material because of its position or condition 58

59. Kinetic energy 59

60. energy of a material in motion 60