A particle moves on a circular path with decreasing speed. Choose the correct statement.
Correct answer: D. The direction of angular momentum remains constant
- A. Angular momentum remains constant
- B. Acceleration is toward the center
- C. Particle moves on a spiral path with decreasing radius
- D. The direction of angular momentum remains constant
Explanation
Amongst the given options, only D is correct. The angular momentum, as we saw, changes in magnitude, but its change if the directions of angular velocity changes. But as that does not happen, the direction of angular momentum will remain constant.
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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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