Two heavy masses are placed at opposite ends of a platform that rotates around its center. A torque is applied to the platform's axle.
The system is released from rest, and the platform begins to rotate with a particular angular acceleration.
If the experiment is performed again with the masses closer to the center of the platform, what will happen?
According to Newton's Second Law, Στ = I α.
The torque is the same in the two cases. Moving the masses closer to the
center reduces the moment of inertia and increases the angular acceleration.