The atmosphere is held to the earth by

State the universal law of gravitation. Write the $SI$ unit of $G$.

The value of the quantity $G$ in the law of gravitation:

Define the "universal law of gravitation".

Calculate the force of gravitation between two objects of masses $10 \; kg$ and $20 \; kg$ at a distance of $10 \; m$ from each other. $\left[G = 6.67 \times 10^{-11} \; Nm^2 kg^{-2}\right]$

The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon with a force that is greater or smaller or the same as the force with which the moon attracts the earth? Why?