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Unformatted text preview: Physics 140 Winter 2011 lecture #13 21 Feb Midterm evaluations on ctools Todays topic: torque Reading Quiz: Which of the following does not directly related to the torque acting on an object? A. The magnitude of the force B. The lever arm C. The angular velocity D. The moment of inertia olling involves a combination of linear and angular motion Rolling Rolling involves a combination of linear and angular motion. r x CM = r a r v CM CM = = cm v r = cm a r = hen an tates d oves g. rolling motion) has both Kinetic energy of rolling When an rotates and moves (eg. rolling motion) has both translational and rotational kinetic energy tot trans rot K K K = + 2 2 1 1 cm 2 2 2 2 1 (1 / ) mv I I m r v = + + cm 2 (1 / ) m I m r v = + Example: Revisit the ball traveling around the loop. What height is necessary to make it around the loop for a hollow all? Ans er: 17 ball? I = 2 mr 2 / 3. Answer: 17 R /6 force acting on an extended object will Torque A force acting on an extended object will...
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This note was uploaded on 01/30/2012 for the course PHYS 140 taught by Professor Uher during the Winter '10 term at University of Michigan.
 Winter '10
 Uher
 Force

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