wedge, A ... is two inclined planes put back to back., screw, A ... is composed of spiral inclined planes., lever, A ... helps lift an object with less effort., inclined plane, An ... is a ramp. It is used to reduce the effort needed to raise or lower an object., pulley, A ... is made up of a wheel and a rope. It is used to raise loads., wheel and axle, A ... are a simple machine. It is used to move heavy loads.

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