Question

If action force is gravitational force, then the reaction force​

Answer 1

The corresponding 'reaction' is the gravitational force that mass exerts on the planet. ... This support force is an 'equal and opposite' force; we know this not because of Newton's third law, but because the object remains at rest, so that the forces must be balanced.

Answer 2

Answer:

So that the forces must be balanced.

Explanation:

The corresponding 'reaction' is the gravitational force that mass exerts on the planet. ... This support force is an 'equal and opposite' force; we know this not because of Newton's third law, but because the object remains at rest, so that the forces must be balanced.