A bit near the center of a rotating disk travels past a fixed point slower than a bit on the outside.

Question

Quizplus · Accepted Answer

This is due to the fact that the circumference of the disk gets larger as you move farther from the center, and since the disk completes one rotation in the same amount of time, the outer bits must travel a greater distance in the same amount of time as the inner bits, resulting in a faster speed for the outer bits.

A Bit near the Center of a Rotating Disk Travels