Chapter 11, Problem 60PCE

Predict/Explain Two spheres of equal mass and radius are rolling across the floor with the same speed Sphere 1 is a uniform solid sphere 2 is hollow Is the work required to stop sphere 1 greater than, less than, or equal to the work required to stop sphere 2? (b) Choose the best explanation from among the following:

1. I.           Sphere 2 has the greater moment of inertia and hence the greater rotational kinetic energy.
2. II.         The spheres have equal mass and speed therefore, they have the same kinetic energy.
3. III.      The hollow sphere has less kinetic energy.