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Simple machines

A simples machine is a tool or device that usually has only one function and a few or no moving parts. Do your know which device missing as below animation?

Now,  we know that a simple machine is used to make work easier and faster.There are various types of simple machine as shown below.
a) Wheel and axle
b) Lever
c) Wedge
d) Pulley
e) Gear
f) Inclined plan
g) Screw

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