1																			2		3
																							4								5
6		7															8																9
	10																								11			12
	13			14						15
																			16
17									18
							19																20							21
								22									23
24																																25
												26	27
																									28		29		30
		31		32											33										34
	35															36						37
						38				39
40															41			42
							43
		44										45								46
																												47		48
						49																50
51																							52
																					53					54
												55		56							57
							58													59
																										60

Across 1. force of attraction acting between two objects 6. waves that require a medium to travel through 8. reaction in which a single compound breaks down to form two or more simple substances 10. how much a machine multiplies force or distance 11. reaction in which two or more substances combine to form a new compound 13. force that opposes the movement of two moving objets 16. the oxidation of an organic compound in which heat is released 18. matter through which a wave travel 19. used to turn energy from the sun into chemical energy 20. distance between two successive identical parts of a wave 23. they occur at the boundary between two different mediums 24. huge surface waves on the ocean caused by an earthquake 26. rate at which velocity changes per time 31. reduces the transfer of energy as heat 33. force in the direction opposite of motion 34. `number of complete waves that pass a given point in a certain time 35. these produce motion 38. the rate at which work is done 41. measure of the average kinetic energy within an object 44. transfer of energy to a body by applying a force that causes motion 45. device used to measure the amount of nuclear radiation 49. particle made of 2 protons and 2 neutrons 50. substance that will slow the rate of the reaction 51. unstable nucleus emits one or more particles or energy in the form of EMR 57. ending substances in a reaction 58. coils of a wave are further apart 59. 2 inclined planes back to back 60. disturbance that transfers energy through matter or space

Down 2. continuous series of nuclear fission reactions 3. mass of an object times its velocity 4. action exerted on a body in order to change its state of rest or motion 5. type of reaction in which a single heavy nuclei is broken down 7. representation of a chemical reaction that uses symbols to show relationships between reactants and products 9. reaction in the sun and stars 12. waves that move at right angles to the direction of the medium 14. protein that speed up a metabolic reaction 15. tendency for an object to resist a change in motion 17. force of gravity of a person or object at the surface of a planet 21. high energy photon emitted by the nucleus 22. energy of motion 25. starting substances in a reaction 27. coils of a wave are close together 28. ratio off useful work output to work input 29. waves produced by an earthquake 30. substance that is acted on by an enzyme 32. force that resists the initial movement of an object at rest 36. designing an object to reduce fluid friction 37. reaction in which heat is given off 39. breakdown of organic molecules to release energy 40. a rection in which heat is taken on 42. energy of position 43. temperature at which energy is at its lowest possible point 46. gas produced when uranium nuclei decays 47. substance that changes the rate of a reaction without being used up 48. most common substance used to find the age of organic substances 52. lowest part of a wave 53. distance an object covers divided by its time 54. inclined plane wrapped around a cylinder 55. energy transferred between objects from warm to cool 56. charged electrons, move quickly