An artificial satellite revolves round the Earth in circular orbit, which quantity remains constant?
Correct answer: A. Angular Momentum
- A. Angular Momentum
- B. Angular Displacement
- C. Linear Velocity
- D. None of the above
Explanation
In a circular orbit under a central gravitational force, the force produces no torque about the Earth's centre, so angular momentum remains constant in magnitude and direction. Angular displacement continuously changes, and linear velocity changes direction even if its speed is constant. Students commonly choose linear velocity by confusing constant speed with constant velocity.
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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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