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lecture21

# lecture21 - Torque Torque and golden rule of mechanics r1...

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Torque Torque and golden rule of mechanics F 1 F 2 r 1 r 2 r 1 r 2 d 2 d 1 W 1 =W 2 F 1 d 1 = F 2 d 2 r 1 /d 1 = r 2 /d 2 F 1 r 1 = F 2 r 2 F 1 F 2 r 1 r 2 F 1 Fr Fr r F sin F 1|| Definition of torque F r F r l r

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Question: Five forces of equal magnitude are applied in the plane of this page to a flat square plate. a) Which forces produce torques about point O that point into the page ? b) Which force produces the largest magnitude of the torque about point O? a) 4 and 5  F 1 0 2 2 L 1.41 L 3 2 L /2 L 0.71 L 4 L 5 L 0.71 L b) 2
Torque and moment of inertia I    2 tan mr r r m r ma r F 2 mr I 2 i i r m I Analog of Newton’s Law for rotation Analog of mass for rotation Question: The magnitude of the angular acceleration of the cylinder is _rad/s 2 . a) 2 b) 4 c) 6 d) 8 M = 8.0 kg R = 0.50 m F x = 4.0 N α -? 2 2 1 MR I CM F r

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Example: Two blocks of masses m 1 = 15 kg and m 2 =20 kg are connected through a string that goes through the pulley of mass M = 2.00 kg and radius R = 25.0 cm.
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lecture21 - Torque Torque and golden rule of mechanics r1...

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