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Across 2. always less than 100% due to friction; equals 100% times output Work/input work 6. metric prefix showing that 1/1000 units are present; for example, 1mm = 1/1000 m 8. force X distance; measured in Newton-meters or Joules 10. variable that the experimenter manipulates during an experiment; usually graphed on the x axis 15. law stating that energy can neither be created nor destroyed, but can be converted from form to form 16. unit of work or energy; a force of 1 N exerted over a distance of 1 m; 1 Nm 17. symbol p; p=mv 21. type of energy causing motion 22. unit describing power; equals use of 1 Joule of energy in 1 s 26. the slope of a graph having distance on the y axis and time on the x axis 28. the side of a lever that a person exerts force upon 30. when moving objects slide over each other, some kinetic energy is converted to this form of energy; also called thermal energy 35. distance divided by time; direction is indicated by a + or - sign; if direction isn't described, then the value is termed speed 38. a force exerted as objects move against each other, due to sticking of surfaces together; acts in a direction that opposes motion 40. acceleration when speed is constant and direction is constant 41. graphical relationship showing both x and y values increasing or decreasing simultaneously 42. rate of change in velocity; acceleration occurs if either speed or direction change 43. metric prefix showing that 1/100 units are present; for example, 1 cm = 1/100m 44. metric unit of measurement for volume 45. a tests of a hypothesis 47. unit of F; equivalent to 4.48 lbs; equals 1 kg m/s/s 49. Newton's law stating that forces act in pairs of equal size but opposite direction

Down 1. metric unit of measure for mass 3. when objects collide, the sum of their momentums (p) before & after the collision are equal; m1v1=m2v2 4. the ability to do work (to make a mass move) 5. an experiment in which tests of a hypothesis are identical except for changes in a single independent variable 7. an educated guess which is either supported or not when conclusions are drawn 9. metrix prefix showing that 1000 units are present; for example, 1 km = 1000m 11. term for negative acceleration 12. description of velocity when a distance/time graph is a straight line 13. multiplication of force by a simple machine; MA; equals output force divided by input force 14. rise over run; (y2-y1)/(x2-x1) 18. sum of potential & kinetic energy when there's no friction 19. how much matter an object contains; measured in g or kg; constant anywhere in the universe 20. equals 746 watts 23. watts; the rate at which energy is used; work/time 24. equals the mass of object times g; the force gravity exerts on a mass; changes if g changes 25. the sum of all forces acting on an object 27. acceleration due to gravity; 9.8 m/s/s on earth 29. type of stored energy; equals mass times gravity times height; increases with the height of an object 31. property of matter increasing with mass & resisting changes in motion 32. Newton's law stating that objects remain at rest unless acted on by unbalanced forces 33. a push or a pull 34. type of graphical relationship showing one value increasing as the other is decreasing 36. rotating (balancing) point for a lever 37. the variable that changes as a result of the manipulations in the independent variable; usually graphed on the y axis 39. Newton's law stating that F=ma 46. metric unit of measure for length 48. multiple by which kinetic energy increases if speed increases three times