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Chapter 8: 8-16Q (page 198)

When a motorcyclist leaves the ground on a jump and leaves the throttle on (so the rear wheel spins), why does the front of the cycle rise up?

Short Answer

Expert verified

The front wheel of the cycle rises up to conserve the angular momentum.

Step by step solution

01

Understanding torque and conservation of momentum

In this problem, the momentum of the total system is conserved as the motorcycle leaves the ground. Also, in this situation, the total torque is equal to zero.

02

Direction of the motorcycle

When a motorcycle is leaving the ground level, and its throttle is on, its rear wheel will rotate faster because there is no torque acting on it. So, in conserving the angular momentum of the motorcycle, the front wheel should rise in the direction opposite to the rear wheel.

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FIGURE 8-52 Problem 47.Atwood machine.
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