Question

State two applications of universal law of gravitation.

Answer 1

The universal law of gravitation:

1. The universal law of gravitation is also known as newton's law of gravitation.
2. It states that everybody in the universe attracts every other body exerting a force that is directly proportional to the masses of bodies and inversely proportional to the square of the distance between them.
3. The value of the gravitational constant $\mathrm{G}=6.67\times {10}^{-11}{\mathrm{Nm}}^2/{\mathrm{kg}}^2$.

Applications of universal law of gravitation are:

1. Universal law of gravitation is used to determine the masses of sun, the earth and the moon accurately.
2. It is also used in calculating the trajectory of astronomical bodies and to predict their motion.