Question

define inertia and give it's importance

compare moment of inertia and mass

Answer 1

Inertia is the property of any object with mass, by which it tends to remain in a particular state it presently is in. A body at rest will continue to be at rest, and a body at motion will continue to move with the same speed and direction, PROVIDED that there is NO external force acting on that body.

More the mass, more the moment of inertia. Hence, Inertia is directly proportional to mass.

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Answer 2

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here's your answer
the moment of inertia of a body about an axis is defined as the sum of product of masses of different particles supposed to constitution of the body (M) and the square of their respective perpendicular distance from the axis of rotation (R)
$I = M {R}^{2}$
moment of inertia of a body is the measure of inability of a body to enter circular motion
it is comparible to Mars in translatory motion which is a measure of inability to change its state

in translatory motion the property of a body by virtue of which it opposes any state of rest or uniform motion along a straight line is called inertia
it is measured in terms of mass similarly in rotatory motion the property of a rigid body by which it opposes any change of state of rest or of uniform motion about the axis is called rotational inertia
it is measured in terms of MI
this MI is a rotational analogue of mass

hope it may be helpful for you

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