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<p>They can also include <a href="page.php?w=computers">computers</a> and sensors that monitor performance and plan movement, often called mechanical systems.</p>

<p>Renaissance natural philosophers identified six <a href="page.php?w=simple_machine">simple machine</a>s which were the elementary devices that put a load into motion, and calculated the ratio of output force to input force, known today as <a href="page.php?w=mechanical_advantage">mechanical advantage</a>.</p>

<p>Modern machines are complex systems that consist of structural elements,</p><p>
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