During motion of a planet from perihelion to epithelium the work done by gravitational force of sun on it is
Answers
Answer:
When the planet swings from the closest point, perihelion, to the furthest point, aphelion, the effective displacement is away from the sun, not toward it. When the force and its displacement are in opposite direction, the work done by the force is said to be negative.
Given that,
During motion of a planet from perihelion to epithelium the work done by gravitational force of sun on it
We need to find the work done
We know that,
The direction of the perihelion to aphelion is opposite to it's direction of gravitational pull.
Due to gravity, the force applied on the planet is always toward to sun.
When the planet move back and forth from the perihelion to the aphelion the actual displacement is away from the sun.
When the force and displacement are in opposite direction,
Hence, The work done by the force will be negative.
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Topic : gravitational force