What is a machine ? Give examples.
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A machine (or mechanical device) is a mechanical structure that uses power to apply forces and control movement to perform an intended action. Machines can be driven by animals and people, by natural forces such as wind and water, and by chemical, thermal, or electrical power, and include a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement. They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems.
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It is a tool or invention which multiplies the effect of human effort. The machine produces a mechanical advantage. Some machines have many parts that move. Examples are bicycles and clocks.
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