Forces and Simple Machines

3. friction can cause a moving object to slow down, speed up, or _______.
6. force that resists the movement of object against each other
9. on the door knob we put the effort on the _______ so the axle can have greater force
10. an example of lever second class and has one wheel
12. block and tackle is a combination of ______ pulley and moveable pulley
14. pulley is a simple machine that has a ______ wheel with a rope
16. gears are wheels and axles with "________" that work together
19. a push or a pull
20. an object that is not moving is at _____
21. the weight of the object being moved
22. the _______ class of lever has an effort between the fulcrum and the load

1. a change in position
2. the ability to do work
4. something to cut
5. an inclined plane is a flat _______ surface
7. a rod
8. an object to make work easier
9. _______ is made up of one or more inclined planes used to force materials apart
11. _______surfaces like rock and sand create much more friction
13. a bar/ beam that turns on a point.
15. work is done when a force moves an object over a _______
16. the inclined plane on the screw is called the ______
17. the force that you apply to cause a simple machine to do work
18. force that pulls all objects toward the center of the earth
19. the point that supports the bar on lever