Two identical balls are at a distance of 15 cm from each other. The mass of balls of 200 g each determine the force of gravity.

Given:

m1 = m2 = 200 grams = 0.2 kilograms – the mass of the balls;

R = 15 centimeters = 0.15 meters – the distance between the balls;

G = 6.67 * 10 ^ -11 m ^ 3 / (kg * s ^ 2) – gravitational constant.

It is required to determine the force of attraction between the balls F (Newton).

According to the law of universal gravitation:

F = G * m1 * m2 / R ^ 2 = 6.67 * 10 ^ -11 * 0.2 * 0.2 / 0.15 ^ 2 = 0.2668 * 10 ^ -11 / 0.0225 =

= 11.9 * 10 ^ -11 = 1.2 * 10 ^ -10 Newton.

Answer: the force of attraction between the balls will be equal to 1.2 * 10 ^ -10 Newton.