Question

State the source of centripetal force that a planet requires to revolve around the sun. On what factors does that force depend? Suppose this force suddenly becomes zero, then in which direction will the planet begin to move if no other celestial body affects it?

Answer 1

The source of centripetal force is the huge gravitational forces between the planet and the sun. It depends upon masses of the planet and the sun and also the distance between them. If the force becomes zero, due to lack of centripetal force, the planet would move tangentially outward to the circular path it used to describe.

Answer 2

The centripetal force required by a planet to remain in orbit around sun is provided by gravitational force of attraction.

The centripetal force depends on radius, mass and orbital speed of planet.

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