1. http://www.youtube.com/watch?v=qybUFnY7Y8w

2. Machine- a device that makes work easier by changing the direction or size of the force.

3. Work- Force move an object in the direction of the Force Work = Force x Distance

4. Work input- Work done on a machine.

5. Work output- Work done by the machine.

6. Mechanical Advantage (M.A.)- number of times a machine multiplies the force input to it.

7. Mechanical Efficiency – Ratio of work output divided by work input. work output work input

8. Incline Plane- A straight slanted Surface.

9. M.A. of an incline plane- length of incline divided by the height object is raised

10. Screw- an incline plane (straight angled surface) wrapped around a cylinder.

11. Wedge- two inclined planes.

12. Lever- a bar that pivot around a fixed point.

13. Fulcrum- the fixed point in which a lever pivots around.

14. Input arm- the distance from the fulcrum to the input force.

15. Output arm- the distance from the fulcrum to the output force (load).

16. Load- Object being moved.

17. Wheel & Axle- 2 circular objects of different sizes

18. M.A. of a Wheel & Axle- Radius of the Wheel Radius of the axle

19. Pulley- grooved wheel with a rope around it. M.A. of pulley- count the number of rope segments. (-1 if it has a fixed pulley) fixed

20. Compound machine- two or more simple machine working together.

22. http://www.youtube.com/watch?v=q ybUFnY7Y8w