1. Simple Machines Unit Three Vocabulary

2. compound machine

3. A combination of simple machines to do work.

4. energy

5. The ability for doing work.

6. force

7. Action that changes an object’s state of rest or motion

8. friction

9. Resistance between two forms of matter when they move against each other.

10. fulcrum

11. The support around which a lever turns.

12. gears

13. Wheels with teeth used to change force, or change the direction of force.

14. Inclined plane

15. A simple machine used to lift or lower objects along a slope using the least force; a ramp.

16. labor

17. Human effort in making or doing work.

18. lever

19. A device which turns on a fulcrum to change effort into motion.

20. machines

21. Devices of fixed and moving parts used for doing work.

22. mechanical

23. Made or worked on by machinery or tools.

24. movement

25. The result of using machines to do work.

26. pulley

27. A grooved wheel with a rope used to change direction using less force.

28. ramp

29. A sloped or inclined passage used to connect to different levels.

30. resistance

31. An opposite force

32. screw

33. An inclined plane twisted around a cylinder. It can be used to hold objects.

34. wedge

35. A piece of hard material, thick at one end and thin at the other used to raise heavy objects or split wood, rocks, etc.

36. wheels

37. Any instrument, circular shaped and moving like a wheel around an axle.

38. work

39. Something done, made, or moved as a result of effort Work = force times distance (W = F x D)

40. gravity

41. The force that gives weight.