# ws15 - Worksheet 15 Rotational Dynamics Questions 1 If a...

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Worksheet 15: Rotational Dynamics Questions 1. If a cylinder is moving with constant angular velocity, then its angular acceleration is zero ( α = τ net I ). This means that the net torque, which is equal to the torque due to friction (friction being the only force in this situation capable of producing a torque), is zero. Since the frictional torque is zero, then τ fric = F fric R , so the frictional force also vanishes. 2. There are three forces acting on this ball: the gravitational force acting at the center of mass, the normal force acting at the point of contact between the ball and the hill, and the frictional force which acts at the same point. The only force capable of producing a torque of the ones listed is friction, because that is the only one perpendicular to its moment arm (about the center of mass). 3. Consider a wheel going down the street with velocity v . To Fgure out how fast the bottom of the wheel is going, let’s go the frame of the wheel. To the wheel, it appears

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ws15 - Worksheet 15 Rotational Dynamics Questions 1 If a...

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