L3_07.pptx - Newtons 2nd Law for Rotation Quiz Two wheels...

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Quiz - Two wheels, start from rest with forces applied as shown. Assume that all of the mass is in the rims, so the moment of inertia I = mr 2 . In order to have identical angular accelerations, how large must F 2 be? A = 0.5 N, B = 1 N, C = 2 N, D = 4 N Clicker channel = 44 Newton’s 2 nd Law for Rotation
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Topics for Today Newton’s second law for rotation (10-7) Work and rotational kinetic energy (10-8) Rolling = Translation + Rotation (11-1)
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Torque , where is the angle between and . Second law is Small wheel Same equation for , setting Wheels
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Work and Rotational Kinetic Energy Work produces a change in kinetic energy This holds for rotational kinetic energy To calculate rotational work, we use angular displacement and torque Since , we have , therefore Rotational power
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Do demo 1Q20.10, angular momentum machine with the masses at 2 R and R . Keep string with weight at fixed radius. Quiz – what is the ratio of the final kinetic energy
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