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11. Torque

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 Shankar, Ramamurti

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11. Torque
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11
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24
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This lecture is a continuation of an analogue to Newton's law: τ= lα. While previous problems examined situations in which τ is not zero, this time the focus is on extreme cases in which there is no torque at all. If there is no torque, α is zero and the angular velocity is constant. The lecture starts with a simple example of a seesaw and moves on to discuss a collection of objects that are somehow subject to a variety of forces but remain in static equilibrium. 00:00 - Chapter 1. Static Equilibrium — Case of Zero-torque, Zero-angular Velocity 03:47 - Chapter 2. The Seesaw Example 12:02 - Chapter 3. The Case of a Rod Supported by Pivot on a Wall 21:04 - Chapter 4. The Case of a Rod Supported by a Wire 29:08 - Chapter 5. The Case of the Leaning Ladder 40:05 - Chapter 6. Rigid Body Dynamics in 3D 01:04:46 - Chapter 7. The Case of a Gyroscope