# Racing cylinders

Moment of Inertia (**I**) is a measure of an object's resistance to changes in a rotation direction.
Moment of Inertia has the same relationship to angular acceleration as mass has to linear acceleration.

If two cylindrical bodies (same mass, same diameter and length) are rolling down on a inclined plane then body which has the smaller inertia moment will reach the end of the plane first. So, in the pair solid cylinder vs thin wall cylinder, the solid cylinder will 'win' and will reach the end of the table first. Both cylinders have the same potential energy at the beginning and then this energy is converted into linear kinetic energy and rotational kinetic energy, but at different ratio.