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simple machines, levers, axle, different ways, task

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The four simple machines each function in different ways, but they all change the direction or the amount of effort put into them. All four of these machines can be used to decrease the amount of force needed to do work or to change the direction of the force. The wheel and axle and some levers can also be used to increase the speed of performance of a task, but doing so always increases the amount of force needed.

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simple machines, levers, axle, different ways, task, direction, effort, force, wheel, function

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