PHY183-Lecture36 - Review: Torque Physics for Scientists...

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March 24, 2006 1 Engineers 1 Engineers 1 Spring Semester 2006 Lecture 36 March 24, 2006 2 Review: Torque Review: Torque r ! = r r " r F March 24, 2006 3 Review: Angular Momentum Review: Angular Momentum ! The angular momentum of a point particle ! The magnitude of the angular momentum ! Angular momentum and torque: ! For rigid objects (and only for them): r L = r r ! r p L = rp sin d dt r L = r r L = I r March 24, 2006 4 Torque and Angular Acceleration Torque and Angular Acceleration ! Starting with our expression for the angular momentum of a rigid body we can show (I of a rigid body is constant) ! We can see the analogy of this result ! with Newton’s Second Law d dt r L = d dt ( I r ) = I d dt r = I r " = r # r = I r r F = m r a
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March 24, 2006 5 Quiz 34.1 Quiz 34.1 ! A mass is twirled by a thread in a vertical circle of constant radius. At what part of the circle does the mass have a nonzero (instantaneous) angular acceleration? A) At the top B) At the bottom C) At midheight D) The angular acceleration is zero at all points on the circle.
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PHY183-Lecture36 - Review: Torque Physics for Scientists...

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