A disk and a sphere are released simultaneously at the top of an inclined plane.They roll down without slipping.Which will reach the bottom first?
A)the one of smallest diameter
B)the one of greatest mass
C)the disk
D)the sphere
E)They will reach the bottom at the same time.

Question

Quizplus · Accepted Answer

The sphere and the disk have the same potential energy at the top of the inclined plane since they are released simultaneously. However, the sphere has a smaller moment of inertia compared to the disk due to its shape. As a result, it will have a greater rotational kinetic energy and will move down the incline faster. Therefore, the sphere will reach the bottom first.

A Disk and a Sphere Are Released Simultaneously at the Top