0. What are simple machines
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Simple machine, any of several devices with few or no moving parts that are used to modify motion and the magnitude of a force in order to perform work. ... The simple machines are the inclined plane, lever, wedge, wheel and axle, pulley, and screw.
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Answer: your required answer :-
the machines that required human energy in order to work .
for examples : levers , wheel , pulleys .
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