A machine is a piece of apparatus with several different parts - each with its own function - which uses the energy put it to produce and direct force. People use machines to make different tasks possible or easier. Vehicles, tools, weapons, and musical instruments are all types of machine. A simple bicycle and a sophisticated satellite are also both machines. In the building industry, machibes range from basic pulleys to complex bulldozers, cranes, drills, and dump trucks.
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