What is a simple machines? How is it different form a complex machine?
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a simple machine is any of various devices that function in a manner basic to any machine, such as a lever, pulley, wedge, screw, or inclined plane. a complex machine is device consisting of two or more simple machines working together.
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devices with few or no moving parts that are used to modify motion and the magnitude of a force in order to perform work. They are the simplest mechanisms known that can use leverage (or mechanical advantage) to increase force. The simple machines are the inclined plane, lever, wedge, wheel and axle, pulley, and screw.
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