Page 58 - Force 10

Inertial mass and Gravitational mass

The mass occurring in the law of motion F = ma is called the inertial mass.

∴ =

Or, Inertial mass =

The mass occurring in the law of gravitation F = G 2 is called gravitational mass of the body.
1
2

F = G
2
Here, is the gravitational mass.

Now, weight of the body on the Earth surface is g

So,

g = G 2

Or, = = a constant
2

Or, ∝

Thus, inertial mass of a body is proportional to its gravitational mass.