Consider a point on a bicycle tire that is momentarily in contact with the ground as the bicycle rolls across the ground with constant speed.The direction for the acceleration for this point at that moment is:
A)upward.
B)down toward the ground.
C)forward.
D)at that moment the acceleration is zero.

Question

Quizplus · Accepted Answer

The point on the bicycle tire that is in contact with the ground is momentarily at rest relative to the ground but is about to move upward and forward as the wheel rolls. This change in velocity indicates acceleration, which is directed upward at that moment, as the point moves from the bottom of the wheel to a higher position on the wheel's circumference.

Consider a Point on a Bicycle Tire That Is Momentarily