# ws16 - Worksheet 16: Angular Momentum Questions 1. A...

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Worksheet 16: Angular Momentum Questions 1. A student spins a wheel directly above her. Since the initial angular momentum of the system was zero, the Fnal angular momentum must also be zero. Hence, if the wheel begins to spin clockwise, it has downwards-pointing angular momentum; hence, the student must have upwards-pointing angular momentum to compensate. In other words, the student begins to rotate counter-clockwise. 2. By causing the football to spin, you’re making it less susceptible to disturbances in the air. Any disturbance would have to exert a torque on the football to make it rotate. Since Δ L = i τdt , the bigger L is, the more torque is required to make it rotate (e.g. veer o± course). 3. The reason for the “structural fuses is based in the fact that as the turbines spin, they have a huge amount of angular momentum. If the engine siezes up, the angular momentum in the turbine is transfered to the airplane, causing it to rotate violently to compensate for the stopped turbine. It is better to lose the engine than to have

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## This note was uploaded on 10/05/2008 for the course PHYSICS 7A taught by Professor Lanzara during the Spring '08 term at University of California, Berkeley.

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ws16 - Worksheet 16: Angular Momentum Questions 1. A...

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