Across

1. Bar on which a wheel turns.

4. Cylinder with a ridge winding around it. It's a simple machine.

6. Strength or force that can be exerted on other bodies.

7. An instrument of work.

9. Something that produces action, a moving force.

11. plane A plank or plane surface put at an angle to a horizontal surface.

12. To move, usually with force or effort.

14. Any device that applies or changes the direction of power force, or motion.

Down

2. A bar which rests on a fulcrum.

3. To move something away by pressing against it.

5. A round frame that turns on a pin or shaft in its middle.

7. A force that causes rotation.

8. Exerting pressure or influence over object or substance.

10. The act of a surface or an object rubbing against each other.

13. Amount of work a machine is expected to perform.