pulley - a device consisting of a rope that passes over a grooved wheel, wheel and axle - a device in which a small wheel is attached at the center of larger wheel , inclined plane - a ramp or a slope that reduce the forces you need to exert in lifting something, wedge -  inclined plane with a thick base and a sharp edge, screw - an inclined plane wound around a post, lever - bar that turns or pivots on a fixed point called fulcrum, simple machines - simple tools used to make our work easier,

Simple Machines

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