The Curves on Bicycle Racetracks Are Steeply Banked, So That

Multiple Choice

The curves on bicycle racetracks are steeply banked, so that the inner edge of each curve is much lower than its outer edge. This banking tips the support force that the track exerts on the bicycle wheel toward the center of each turn. That center-directed or centripetal force on the bicycle is important because it

A) helps the bicycle accelerate inward to complete each turn without skidding.
B) it does work on the bicycle during each turn and thus increases the bicycle's energy.
C) balances the outward centrifugal force that the bicycle experiences as it completes each turn, so that the bicycle experiences zero net force.
D) it does negative work on the bicycle during each turn and thus decreases the bicycle's energy.