simple machines

1. pulley

1.1. pull

2. wheel and axle

2.1. 2types

2.1.1. wheel turns and axle stops

2.1.2. wheel

3. lever

3.1. up and down

3.2. balance

3.3. lift

4. wedge

4.1. cut

4.1.1. sharp things

5. inclined plane

5.1. less effort

5.2. slide