Question

formulas of gravitational chapter class 9​

Answer 1

The Universal Law of gravitation was coined by Sir Issac Newton.

As per the law:

Everybody in the universe attracts every other body with a force, which is directly proportional to the product of their masses and inversely proportional to the square of distance between them.

This law is fundamental to understanding gravitation for class 9. For understanding this concept better, let us consider two objects of masses M and m that are at a distance r from

Now, let’s assume that F is the force of attraction betwe Gravitation for Class 9en two objects P and Q.

So, if we take the universal law of gravitation into account, then the force F is proportional to the product of masses of objects P and Q that is

F∝M×m (1)

and the force is inversely proportional to the square of distance between these two objects that is

F∝1/r^2 (2)

When we combine both equations (1) and (2), we derive

F∝Mm/r^2 (3)

or

F=GM m/r ^2 (4)

Note that in this case, G is the constant known as Universal Gravitational constant.

Nm.2Kg−2 is the SI unit of gravitational constant G

The value of G was first established by Henry Cavendish (1731-1810) and it is

G=6.673×10−11Nm2Kg−2