Simple Machines

 

Part A

 

1. Lever

 

2. Wedge

 

3. Pulley

 

4. Inclined Plane

 

5. Wheel and Axle

 

6. Screw

 

Part B

 

First, because the wedge and the inclined plane are very similiar. Secondly, the lever and the pulley both work by applying force onto one side which then moves the object.