Concept Of Physics Gravitation

H C Verma

1.   Two spherical balls of mass $10$ kg each are placed $10$ cm apart. Find the gravitational force of attraction between them.

Gravitational force of attraction $\\$ F = $\frac{GMm}{r^2}$ $\\$ $\frac{6.67\times 10^{-11} \times 10 \times 10}{(0.1)^2}$ = 6.67 $\times 10^{-7}$ N

2.   Four particles having masses m, $2$ m, $3$ m and $4$ m are placed at the four corners of a square of edge a. Find the gravitational force acting on a particle of mass m placed at the centre.