simple machines

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simple machines by Mind Map: simple machines

1. levers

1.1. see saw

2. wedge

2.1. knife

3. pulley

3.1. a pulley

4. wheel and axle

4.1. bike

4.2. bike

4.2.1. a bike is a compound machine

4.3. car

5. screw

5.1. a screw is a mini inclined plane

6. inclined plane