What are not simple machines?
Simple machine, any of several devices with few or no moving parts that are used to modify motion and force in order to perform work. The simple machines are the inclined plane, lever, wedge, wheel and axle, pulley, and screw.
The option which is not a simple machine is bicycle.
Simple machine consists of few or no moving parts. They are used to change the motion and force direction to perform work. The simple machines includes the inclined plane, lever, wedge, wheel and axle, pulley, and screw.
A pulley is a plain cylinder with some thickness. A ramp is just a plank or plane or inclined surface of any material. A wood screw is a simple machine. The bicycle is a moving machine which has many number of simple machines attached together to obtain a mechanism which drives the bicycle.
Thus, bicycle is not a simple machine.
Learn more about simple machines.
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