The angular momentum of the particle rotating with a central force is constant due to:
Correct answer: D. Zero torque
- A. Constant torque
- B. Constant force
- C. Constant linear momentum
- D. Zero torque
Explanation
A central force acts along the radius and exerts no lever arm about the center, so the torque is zero. With τ = dL/dt = 0 the angular momentum L is conserved, making option d the correct cause.
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About Angular and Linear Quantities
Rotational motion relates angular displacement, angular velocity and angular acceleration to linear displacement, tangential velocity and tangential acceleration through the radius. Questions use radians, v equals r omega and tangential acceleration, while distinguishing tangential velocity from centripetal acceleration and angular quantities from their linear counterparts.
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