(C) 2019
A solid sphere and a hollow sphere of the same mass and radius are placed on an inclined plane. The hollow sphere rolls down the plane more easily. Why?
The correct answer is: The hollow sphere has less inertia.
The inertia of a body is the resistance offered by the body to a change in its state of motion. The hollow sphere has less inertia than the solid sphere because the mass of the hollow sphere is distributed over a larger area than the mass of the solid sphere. This means that the hollow sphere is easier to move than the solid sphere.
