The angular momentum of a rotating rigid body is given by
Correct answer: B. I omega
- A. I alpha
- B. I omega
- C. m v r squared
- D. half I omega squared
Explanation
Angular momentum is the moment of inertia multiplied by the angular speed, the rotational analogue of linear momentum mv. The product I alpha is torque, the analogue of force, and half I omega squared is rotational kinetic energy. Keeping these three analogues apart is what most rotational questions actually test.
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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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