A disk and a ball both of radius r and mass m,are suspended at a point on the edge of the object at the maximum radius.Which has the smaller period of oscillation?
A)ball
B)disk
C)the same
D)Not enough information

Question

Quizplus · Accepted Answer

The period of oscillation of a pendulum depends on the distance between the point of suspension and the center of mass. For both the disk and the ball, the distance between the point of suspension and the center of mass is equal to the radius, r. However, the ball has all its mass concentrated at the center, while the disk has its mass spread out over the entire object. This means that the ball has a smaller moment of inertia than the disk and will therefore have a shorter period of oscillation.

A Disk and a Ball Both of Radius R and Mass