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# lecture13 - Rotation(III Rotation(III • Torque and...

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Unformatted text preview: Rotation (III) Rotation (III) • Torque and angular acceleration • “Moment of inertia” Text Sections : 10.7, and part of 10.4 Angular velocity vector: parallel to the axis of rotation, following a similar right-hand rule: Angular acceleration vector: parallel to the angular velocity, if | ϖ| is increasing. ϖ rotation direction ϖ Force causes linear acceleration: F net = m a Torque causes angular acceleration: τ net = I α ? Q: How much torque does it take to rotate a particular object? Better: How much torque does it take to change the rate of rotation ? What property of an object determines the response (angular acceleration) to an unbalanced external torque? Force causes linear acceleration: F net = m a Torque causes angular acceleration: τ net = I α ? The angular acceleration of a particle is proportional to the net torque applied to it. Example : A particle accelerates in a circle. Break the net force on it into radial and tangential components. Only F t causes tangential...
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lecture13 - Rotation(III Rotation(III • Torque and...

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