Phys Notes March11

Phys Notes March11 - Y15 ch10 1 Ch 10 Angular Momentum(Recall The torque of a force describes the tendency of the force to cause or change

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Y15 ch10 1 Ch 10 Angular Momentum (Recall) The torque of a force describes the tendency of the force to cause or change rotational motion of the body on which the force acts. τ = Fl = Fr sin ϕ = F tan r, τ = r × F Angular acceleration of a rigid body is proportional to the sum of the torques acting on it ; the proportionality con- stant is given by the moment of inertia (for motions with fixed direction of the axis of rotation). α = 1 I τ tot , ( τ tot = I α ) , τ tot = τ tot,external The sum of the torques of all forces acting on a rigid body is equal to the sum of the torques of external forces acting on it. Another form of this: If rotation about z -axis then τ tot z = I α z
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Y15 ch10 2 ¨ Speed of a rolling sphere at the bottom of the incline; two ways: (a) Using conservation of energy (b) Computing first acceleration, as in Example 10.7 – please read. f19 Rolling Friction (p. 329) – please read.
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Y15 ch10 3 10.4 Work, power, work theorem in rotational motion (not on test 2) W = Z θ 2 θ 1 τ d θ , Power: P = τω Work theorem W = K 2 K 1 = 1 2 I ω 2 2 1 2 I ω 2 1 – please read.
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Y15 ch10 4 10.5 Angular Momentum
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This note was uploaded on 03/19/2008 for the course PHYS 2305 taught by Professor Tschang during the Spring '08 term at Virginia Tech.

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Phys Notes March11 - Y15 ch10 1 Ch 10 Angular Momentum(Recall The torque of a force describes the tendency of the force to cause or change

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