Question

The force of attraction between any two bodies in the universe is _________ .
A) Gravitation
B) Polarity
C) Induction
D) Joule

Answer 1

Hint: In the universe there is a force of attraction that acts between all the bodies. This force is directly proportional to the product of masses of the bodies and inversely proportional to the square of the distance between them. This force is called gravitational force. It was given by Isaac Newton.

Complete answer:
Each body in the universe exerts a force of attraction on another body. This force is known as gravitational force.
Let there be two bodies having masses M and m and the distance between the bodies is r.
The force of attraction between the bodies is given by following formula,
\[F = \dfrac{{GMm}}{{{r^2}}}\]
Where,
G is the universal gravitational constant having value $G = 6.67 \times$ $10^{-11} m^3 kg^{-1} s^{-2}$. The dimension of gravitational constant is $[M^{-1} L^3 T^{-2}]$.
Above formula of gravitational force shows that the force of attraction is directly proportional to the product of masses of the bodies and inversely proportional to the square of the distance between them.
Gravitational force is the force of attraction between any two bodies in the universe.

Hence, option (A) is correct.

Note: Gravitational force is a very common force that exists in the universe because it acts between all the bodies that attract each other. Hence, it is also known as an attractive force. But it is not the only force existing in the universe. There are four types of fundamental forces existing in the universe. These forces tell us how certain objects interact and the decay of particles in nature.
1. Gravitational
2. Electromagnetic Force
3. Strong Force
4. Weak Force