Week 9 - Modesto Junior College

Week 9 3. When you turn while running, you must lean in the direction of a turn or risk falling over. If you lean left as you turn left, why don t you fall over to the left? The leftward frictional force on your feet keeps you balanced. 4. If a motorcycle accelerates too rapidly, its front wheel will rise up off the pavement. During this stunt the pavement is exerting a forward frictional force on the rear wheel. How does that frictional force cause the front wheel to rise? The huge forward force on the bottom of the rear wheel produces a torque on the motorcycle and rider about their combined center of mass. If this torque is large enough, it overcomes the motorcycle's natural forward-back stability and the motorcycle rotates so that its front wheel leaves the pavement.

E.11 As the blower pushes air toward the leaves, that air pushes the blower away from the leaves. 12. When a sharpshooter fires a pistol at a target, the gun recoils backward very suddenly, leaping away from the target. Explain this recoil effect in terms of the transfer of momentum.

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