Rotational Motion

Question 1

Define Moment of Inertia

Answer 1

Moment of inertia is defined as a quantity expressed by a body resisting angular acceleration, which is sum of the product of mass of every particle and the square of the distance from the axis to the point.
I=MR^2

Question 2

State any four physical significance of moment of Inertia

Answer 2

The moment of inertia depends upon:-
1) distance from the axis
2) mass of the particle
3) distribution of these masses in the given axis
4) Inertia increases with increase in mass

Question 3

Define radius of gyration

Answer 3

It means that the mass of that object is effectively at distance K from the axis of rotation.
In this case, K is the radius of gyration.

Question 4

State what does radius of gyration depends upon

Answer 4

It depends upon the
1) mass of the object
2) and how the mass is distributed around the axis
3) larger the value of K further the mass from axis

Question 5

State conversation of angular momentum.

Answer 5

Angular momentum is constant and concerned when torque acting on it is zero