Across
- 4. to want very much
- 5. has two parts: a bar and a fixed point called a fulcrum
- 9. a machine with only a few parts
- 11. force applied to a lever
- 13. to shake back and forth unsteadily
- 16. force applied to the load
- 18. in a tired way
- 19. to sit on top of something
- 20. to hold tightly
Down
- 1. the object the lever moves
- 2. 2 or more simple machines
- 3. a pulley attached to a movable object
- 6. a pulley attached to an unmoving object
- 7. two parts: a wheel attached to a central axle
- 8. a flat, slanted surface
- 10. with great happiness
- 12. sure of oneself
- 14. grooved wheel with a cord
- 15. to trim tree branches
- 17. supports the bar and allows it to turn