## Tuesday, August 10, 2010

## Moment of Inertia

Tuesday, August 10, 2010 by Faizan Bhatti

Moment of Inertia:

Increasing the mass increases the moment of inertia, symbolized by I, which is sometimes called the rotational inertia of an object. But the distribution of the mass is more important, i.e. distributing the mass further from the centre of rotation increases the moment of inertia by a greater degree. The moment of inertia is measured in kilogram metre

^{2}(kg m^{2}).The energy required or released during rotation is the torque times the rotation angle; the energy stored in a rotating object is one half of the moment of inertia times the square of the angular velocity. The power required for angular acceleration is the torque times the angular velocity.

Torque

Torque τ is the twisting effect of a force F applied to a rotating object which is at position r from its axis of rotation. Mathematically,

τ = r × F

Where × denotes the cross product. A net torque acting upon an object will produce an angular acceleration of the object according to

τ = Iα

Just as F = ma in linear dynamics.

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Physics BSC
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## 3 Responses to “Moment of Inertia”

November 18, 2010 at 6:39 AM

very good information. I want an answer of the following question as soon as possible, please try to give it in 3 to 4 days.

QUESTION:

If we have a two masses, then what will happen to moment of inertia if we increasing the distance between them or decreasing the distance between two masses?

December 16, 2010 at 3:30 AM

actually I=mr.r this means that moment of inertia id directly proportional to square of perpendicular distance between the 2 bodies. there for is dist is increased the moment of inertia of the bodies also increases and vice verse

May 3, 2011 at 9:42 PM

Thanks for this

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