PS: Lesson 4.3

2. distance between two adjacent threads of a screw
4. simple machine consisting of a rope or cable that turns around a wheel
5. type of pulley that that connects to the object being moved
6. decreases IMA to become AMA
11. simple machine that has a slanted surface
13. a longer slope on an inclined plane _______________ mechanical advantage
14. any device that makes work easier by changing the size or direction of a force
17. number of classes of levers
19. compound machine used in the Tour de France
20. simple machine that consists of two back-to-back inclined planes
21. part of the screw where the blade is inserted

1. simple machine that consists of two circular objects of different size
3. mechanical advantage of a block and tackle with one fixed and three movable pulleys
6. type of pulley that is attached to something that doesn't move
7. type of machine that results from the combination of two or more simple machines
8. simple machine that consists of an inclined plane wrapped around a cylinder
9. point at which a lever pivots
10. this increases as required force decreases
12. type of force that represents the amount of force without the use of a machine
15. ridge or inclined plane that wraps around the outside of a cylinder
16. simple machine made of a rigid bar that pivots at a fixed point
18. example of a second-class lever that is used in gardening