what is the differnce between total gravitational force and weight of a body?
Gravitational force is the force exerted by one body on the other by the virtue of their masses.It’s equal and opposite. F=Gm1m2/(r^2) where G is the universal gravitation constant and r is the distance between the centre of the masses and F is the gravitational force and m1 and m2 are the masses of the two bodies.They exert equal and opposite F on each other. Weight of the body on the surface of the earth is equal in magnitude to the Gravitational force.Weight is the force required to keep a body in static position, while gravitational force even exists between dynamic bodies in nature. Weight has no relation with centripetal force as we are not moving wrt earth, while the gravivational force of 2 bodies in space accounts to movement and and the force mV^2/r= GmM/r^2 ie the centripetal force of moon around the earth is equal to gravitational force between them.We can’t say moon has weight as it’s not static on earth, but it has mass m and definitely exerts a gravitational force on it.
