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Asked in PMC Practice Test 18 (2021) 2021

For clockwise rotations, the direction of angular velocity is:

Correct answer: B. Negative

  • A. Positive
  • B. Negative
  • C. Zero
  • D. Infinite

Explanation

The rate of change of angular displacement of a body is called angular velocity. The right-hand rule can be used to find the direction of the angular velocity. The angular velocity is negative when the direction of rotation of a body is in clockwise direction. It is negative because when an object rotates clockwise, the angular velocity points away from you along the axis of rotation. For an object rotating counterclockwise, the angular velocity points toward you along the axis of rotation

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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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