NEET Physics Question - Gravitation

Assertion (A): When planet moves in elliptical orbit around Sun. Its angular momentum about sun remains conserved.

Reason (R): Total mechanical energy of planet - sun system remains conserved.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

Assertion (A) is true. Gravitational force is a central force, so the torque about the Sun is zero, leading to angular momentum conservation. Reason (R) is also true. Gravitational force is conservative, so total mechanical energy of the system is conserved. However, energy conservation does not explain angular momentum conservation, as they are distinct conservation laws.

Rankers Physics

Question 15: Planetary Orbits and Conservation Laws

Solution:

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