A device for increasing (or decreasing) a force or simply changing the direction of a force
Device thar makes work easier only one movement .... by changing the force exerted in size or the direction of both
Devices that make work eaiser in more then one movement
Sloping surface to raise objects
Difference between rotation and revolution
rotational is on and internal axles while revolution is on an external axles
Spins on internal axles resistance of object to change its motion
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