If the body is rotating with uniform angular velocity, then its torque is:
Correct answer: A. Zero
- A. Zero
- B. Clockwise
- C. Maximum
- D. Remains the same
Explanation
Explanation:If the body is rotating with uniform angular velocity, its angular momentum remains constant, and therefore there is no change in its rotational motion. Since torque is the rate of change of angular momentum, the torque acting on the body is zero. This option is not correct because if there is a clockwise torque acting on the body, it will cause the angular velocity to change, which is not the case when the body is rotating with uniform angular velocity. This option is also incorrect because the maximum torque occurs when the force is perpendicular to the axis of rotation.This option is also incorrect because if the body is rotating with uniform angular velocity, then its torque is zero, not remains the same.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Angular Velocity
Angular velocity describes how quickly angular displacement changes with time, with ω = Δθ/Δt and units of radians per second. Questions relate angular and linear motion through v = rω, use the direction given by the right hand rule, and distinguish angular velocity from angular acceleration and ordinary frequency.
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