Reducing Six Simple Machines to Four
- Pulley
- Wheel and axle
- Lever
- Wedge
- Screw
- Inclined plane
How we can reduce to four:
There is no need for a wedge, since we already have an inclined plane which is basically the same thing, and we don't need a wheel and axle since the pulley includes that. The screw is just an inclined plane wrapped around a point.
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