2012_1061_Lecture_Ch_10

Calculate the net torque on this compound wheel due

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Unformatted text preview: ch other on an axle that passes through the center of each. Calculate the net torque on this compound wheel due to the two forces shown, each of magnitude 50 N. Counterclockwise is positive Example Two forces (FB = 20 N and FA = 30N) are applied on a meter stick which can rotate about its left end. Force FB is applied perpendicularly at the midpoint. Which force exert the greater torque or both the same? Rotational Dynamics; Torque and Rotational Inertia Multiply both sides by R The quantity mR2 represent the Moment of Inertia Take a solid cylinder and think of each point on the cylinder as a particle in rotation at a different position from the center. Axis fixed Rotational Inertia (continued) In this case the summation is called the Moment of Inertia of the object Combining the above equations we obtain Newton’s Second Law for Rotation This relation is valid for rotation of a solid about a fixed axis. If the axis moves like a ball rolling down a ramp we can write. Here the axis direction is fixed but the axis may accelerate The moment of inertia is a measure of the rotational inertia of an object Two small weights of mass 5.0 kg and 7 kg are mounted 4.0 m apart on a light rod (whose mass can be ignored) as shown. Calculate the moment of inertia of the system (a) when rotated about an axis half way between the weights, and (b) when rotated about an axis 0.50 m to the left of the 5...
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This note was uploaded on 02/03/2014 for the course PHYSICS 1061 taught by Professor Tsankov during the Fall '09 term at Temple.

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