6 Simple Machines
1. Lever
2. Pulley
3.Wedge
4. Wheel and axle
5.Screw
6.Inclined Plane
Why can we reduce 6 to 4?
An inclined plane is the same simple machine as a wedge, so there does not have to be two different simple machines. The screw has the same function as the inclined plane and wedge.
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