Heena Sharma, Shubhankat Vats and, Rashmi Gupta Solutions for Chapter: Gravitation, Exercise 1: Check Point 01

Why is Newton’s law of gravitation called as universal law?

What are the numerical value and SI unit of $\mathrm{G}$?

What is the force of gravity between the earth and the mass of $20 \mathrm{k}\mathrm{g}$ placed on its surface? (Given, $g=9.8 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{s}}^2$}\right.$)

Name the source of centripetal force that the moon requires to revolve around the earth.

If the distance between masses of two objects is increased by five times, by what factor would the mass of one of them have to be changed to maintain the same gravitational force? Would there be an increase or a decrease in the same?