Chapter11 - Chapter 11: Angular Momentum Demos:

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PHYS276, S09 Chapter 6 1 Chapter 11: Angular Momentum Demos: http://www.physics.umd.edu/deptinfo/facilities/lecdem/lecdem.htm D3-01 masses sliding on rotating cross arms D3-04 rotating stool and weights Thanks to Prof LaPorta and “Peer Instruction” by Eric Mazur
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Definition of Angular Momentum PHYS276, S09 Chapter 6 2 D3-01: start spinning and watch it spin Newton’s second law: something moving at a constant velocity will continue with that velocity (both magnitude AND direction) unless acted upon by an external force. F = d p dt p=m v No external forces -> momentum is conserved Rotational analogy: angular momentum
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Angular Momentum PHYS276, S09 Chapter 6 3 We know: τ = rx F = rx d p dt Define: L rx p (r is from axis of rotation) d L dt = rx d p dt + d r dt x p = rx d p dt + vx p = rx d p dt = d L dt =
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Example PHYS276, S09 Chapter 6 4 L = rx p L = rmv direction: out of the board Particle of mass m moves in a circle with a constant speed v
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Chapter11 - Chapter 11: Angular Momentum Demos:

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