simple machines

1. 1st class levers

1.1. a rigid bar that is free to move around a fixed point

2. 2nd class levers

2.1. a rigid bar that is free to move around a fixed point

3. wedge

3.1. a V-shaped object whose sides are too inclined planes sloped toward each other

4. screw

4.1. a inclined plane wrapped around a cylinder.

5. wheel and axle

5.1. a simple machine that consists of two rigidly attached disks or cylinder, each one with a different radius.

6. work

6.1. the product of distance and the force in the direction an object moves

7. power

7.1. the rate of doing work

8. mechanical advantage

8.1. the number of times that a machine increases an input force.

9. 3rd class levers

9.1. a rigid bar that is free to move around a fixed point

10. incline planes

10.1. a slanted surface along which a force moves an object to a different elevation.

11. pulley

11.1. a simple machine that consists of rope that fits into a groove.