<P> A flywheel is a mechanical device specifically designed to efficiently store rotational energy . Flywheels resist changes in rotational speed by their moment of inertia . The amount of energy stored in a flywheel is proportional to the square of its rotational speed . The way to change a flywheel's stored energy is by increasing or decreasing its rotational speed applying a torque aligned with its axis of symmetry, </P> <P> Common uses of a flywheel include: </P>

What is the function of a flywheel on an engine