- Lever
- Wheel and axle
- Pulley
- Inclined plane
- Wedge
- Screw
You can reduce the six simple machiens to four: lever, wheel and axle, pulley and inclined plane. The wedge can be eliminated because it is basically two inclined plane put together. The screw can also be eliminated because it essentially is an inclined plane put on a wheel and axle.
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