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For the pulley simple machine shows how to calculate the amount of work done when raising an object and why simple machines do not make your work easier! A simple machine is a mechanical device that changes the direction and the 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 that were defined by Renaissance scientists: the lever, the wheel and axel, the inclined, the screw, the wedge and the pulley. Simple machines do not make work easier, less input force may be needed but the force must be applied over a longer distance. You can see a listing of all my videos at my website, http://www.stepbystepscience.com Link for sharing this video: • Simple Machines (4 of 7) Pulleys; Calculat... Please support my channel by doing all of the following: (1) Subscribe to my channel, get all my excellent physics, chemistry and math videos. (2) Give me a thumbs up for this video. (3) Leave me a nice positive comment. (4) Sharing is Caring, share this video with all your friends.