Simple machine

The screw's self-locking property is the reason for its wide use in threaded fasteners like bolts and wood screws

Illustration of a four-bar linkage from Kinematics of Machinery, 1876

A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. Usually the term refers to the six classical simple machines which were defined by Renaissance scientists:

单词	Compound machines
释义	Compound machines 英语百科 Simple machine A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. Usually the term refers to the six classical simple machines which were defined by Renaissance scientists:
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Compound machines

Simple machine