A planet in elliptical orbit around a star moves from the point in its orbit furthest from the star (A) to the closest point (P). Choose the planet to be your system. The work done by the force of gravity during this movement is:

Gravitational force is usually considered as work done against gravity (-ve) and work by gravity ( +ve ) and also When work isn't done by or against gravity work done in this case is zero.

Gravitational force can be define as that force that attracts a body to any other phyical body or system that have mass.

The planet been considered as our system in this case is assumed to have mass, and ought to demonstrate such properties associated with gravitational force in such system. Such properties include the return of every object been thrown up as a result of gravity acting downwards. The orbiting nature of object along an elliptical part when gravitational force isn't acting on the body and it is assumed to be zero.

snehashish65 snehashish65 · Answer 2 · 2021-11-19T11:51:15+01:00

The work done by the force of gravity during this movement is zero because the body is not acting against or by gravity.

The given problem is based on the concept of gravitational force and work done by gravitational force. The gravitational force can be define as that force that attracts a body to any other physical body or system that have mass.

The Gravitational force is considered as work done against gravity and work by gravity.
If the work is done against the gravity, then by sign convention, it is called negative work. And work done by the gravity is positive work. When work isn't done by or against gravity work done in this case is zero.

The planet been considered as our system in this case is assumed to have mass, and all the analysis are to be performed within the system.
Such properties include the return of every object been thrown up as a result of gravity acting downwards. The orbiting nature of object along an elliptical part when gravitational force is not acting on the body and it is assumed to be zero.

Thus, we can conclude that, considering a planet as a system, the work done by the force of gravity during orbital movement is zero.

Learn more about the work done by gravity here:

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