Racing on an inclined plane
You have two objects with the same weight. Place them in the START position and release both of them exactly at the same time.
How does it work
Both objects weigh the same, but their masses are distributed differently. This results in different moments of inertia while the objects are rotating. This value is a measure of inertia of a body which rotates around fixed axis. One of the objects has a greater moment of inertia, that is why it is less susceptible to forces acting on it and it speeds up slower on the plane.