PLEASE HELP

3 balls (30cm, 30cm, 20cm). Small ball on the big balls. Mass small ball: m, another ball: M. And g for gravitation. Force for one of the big ball to the small ball?

Question

PLEASE HELP

3 balls (30cm, 30cm, 20cm). Small ball on the big balls. Mass small ball: m, another ball: M. And g for gravitation. Force for one of the big ball to the small ball?

anonymous · Answer

Force between the big ball and small ball would only depend the the mass of the small ball; not on anything below it.

Newtons 3rd law tells you that the force pushing down will be equal in magnitude but opposite in direction of the force pushing back up (sometimes called the 'normal force'). 

Newtons 2nd law F=m*a will give you exact answer. 

$$F=mass \small ball * g = 9.81m[kg*m/s ^{2}]$$