Question

Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth

NCERT Class IX
Sciences - Main Course Book

Chapter 10. Gravitation

Answer 1

Suppose the earth is a sphere of mass M and radius R and if an object of mass m is placed on the surface of earth then magnitude of the gravitation force between the body and the earth will be  F=G Mm/R*r

Answer 2

Consider F is the force of attraction between an object on the surface of earth and earth.

Also consider ‘m’ is the mass of the object on the surface of earth and ‘Me’ is the mass of earth.

Therefore the formula for magnitude of the gravitational force between the earth and an object on the surface is given as

G = GM1m2 / r²