In many problems in previous chapters, cars and other objects that roll on wheels were considered to act as if they were sliding without friction.
(a) Can the same assumption be made for a wheel rolling by itself? Explain your answer. (b) If a moving car of total mass 1300 kg has four wheels, each with rotational inertia of 0.705 kg·m 2 and radius of 35 cm, what fraction of the total kinetic energy is rotational?