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In physics, a force is said to do work when it acts on a body, and there is a displacement of the point of application in the direction of the force.

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A park is an area of open space provided for recreational use. It can be in its natural or semi-natural state, or planted, and is set aside for human enjoyment or for the protection of wildlife or natural habitats.

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An engine or motor is a machine designed to convert energy into useful mechanical motion. Heat engines, including internal combustion engines and external combustion engines (such as steam engines) burn a fuel to create heat, which then creates motion.