**Choose the wrong option. (a) Inertial mass is a measure of difficulty of accelerating a … neighbouring heavy objects but the…**

###### Answers:

(d)

Key concept: Inertial mass: It is the mass of the material body, which measures its inertia.

Gravitational Mass: It is the mass of the material body, which determines the gravitational pull acting upon it.

According to the principle of equivalence, Gravitational mass of proton is equivalent to its inertial mass and is independent of presence of neighboring heavy objects.

Important point: Comparison between inertial and gravitational mass:

• Both are measured in the same units.

• Both are scalars.

• Both do not depend on the shape and state of the body.

• Inertial mass is measured by applying Newton’s second law of motion whereas gravitational mass is measured by applying Newton’s law of gravitation.

• Spring balance measures gravitational mass and inertial balance measure inertial mass.