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<p>keeping it balanced.  The inverted pendulum is a classic problem in <a href="page.php?w=dynamics_%28mechanics%29">dynamics</a> and <a href="page.php?w=control_theory">control theory</a> and is used as a benchmark for testing control strategies.  It is often implemented with the pivot point mounted on a cart that can move horizontally under control of an electronic servo system as shown in the photo; this is called a <b>cart and pole</b> apparatus. Most applications limit the pendulum to 1 <a href="page.php?w=Degrees_of_freedom_%28mechanics%29">degree of freedom</a></p><p>
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