Simple machines are useful because they reduce effort or extend the ability of people to perform tasks beyond their normal capabilities. ... While simple machines may magnify or reduce the forces that can be applied to them, they do not change the total amount of work needed to perform the overall task.
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Simple machines are useful because they reduce effort or extend the ability of people to perform tasks beyond their normal capabilities. ... While simple machines may magnify or reduce the forces that can be applied to them, they do not change the total amount of work needed to perform the overall task.