Can mass of a body be taken concentrated at its center mass for the purpose of calculating its rotational inertia?

Open in App

Solution

No, mass cannot be considered at its center mass for calculating its inertia, because inertia is calculated about the axis passing through center of mass(co-inciding with the Center of Gravity).

Suggest Corrections

Similar questions

Q. Assertion :The mass of a body cannot be considered to be concentrated at the centre of mass of the body for the purpose of computing its moment of inertia. Reason: Then the moment of inertia of every body about an axis passing through its centre of mass would be zero.

Q. Assertion (A) : Moment of inertia of a rotating rigid body remains constant irrespective of its angular velocity.
Reason (R) : Neither mass of rigid body nor distances of particles of rigid body from axis of rotation change during the rotation.

Q. Why is the mass of a body concentrated at the center of gravity?

Q. Two thin discs each of mass 4.0 kg and radius 0.4 m are attached as shown in figure to form a rigid body. The rotational inertia of this body about an axis perpendicular to the plane of disc

B

and passing through its center is.

Two thin discs each of mass 4.0 kg and radius 0.4 m are attached as shown in figure to form a rigid body. What is the rotational inertia of this body about an axis perpendicular to the plane of disc $B$ and passing through its center?

Join BYJU'S Learning Program