to the square of d example, that if d gets actor of 6. F becomes ller. mass of the earth is Ithat of the moon is e distance between the moon is 3.84×105 km, exerted by the earth on = 6.7 x 10-¹¹ N m² kg 2) th, M= 6 x 1024 kg oon, kg en the earth and the = 105 km explained several phenomena which were believed to be unconnected: (i) the force that binds us to the earth; (ii) the motion of the moon around the earth; (iii) the motion of planets around the Sun; and (iv) the tides due to the moon and the Sun. 10.2 Free Fall Let us try to understand the meaning of free fall by performing this activity. Activity Take a stone. Throw it upwards. 10.2 It reaches a certain height and then it starts falling down. We have learnt that the earth attracts obiects towards it Thin in due to the force, that IS, F = mg From Eqs. (10.4) and mg=G= or g=G where M is the m the distance betwe Let an object the earth. The dis equal to R, the ra objects on or ne= MX mg = G g=G