The Universal law of Gravitation

Q. The universal law of gravitation

Ans:- The universal law of gravitation gives the gravitational force between

1. A point mass and the Earth only.
2. Two bodies that are charged only.
3. Any 2 bodies that have some mass.
4. The Sun and the Earth only.

The correct answer is (3) Any 2 bodies that have some mass.

Explanation

To answer the question we must first try to recapture the universal gravitational force formula. This depends on any two body’s mass and distance between the objects along with the universal gravitational constant. From this particular formula which involves the Universe’s gravitational constant, the required answer can be obtained. 

The formula that can be used for calculation is F = G (m₁m₂)/r² 

In the above formula, F stands for gravitational force

G stands for gravitational constant,m₁, as well as m₂, are the masses of the two-body and r is the radius of the Earth. 

From the formula, it can be easily noticed that Gravitational force varies directly with the mass of each body. Further, it can be noticed that the force is inversely proportional to the earth’s radius. Next, from the formula, it can be concluded that the gravitational force of any two bodies having some mass can be calculated from it. Hence, it can be said that the other options are not true as in these options more mass and no particular charged body is there. 

In this context, it should be noted that Newton’s gravitational law is also called the universal law of gravitation.