For the shape shown, determine (a) the polar moment of inertia of the circular area alone (without the square hole), (b) the polar moment of inertia of the area shown (with the square hole), (c) the percent change in moment of inertia in the shape by having added the square hole, (d) the percent change in area by having added the square hole. (The square is centered on the circle.) r

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Moment of Inertia

Inertia can be termed as a resistance offered by a body to change its state. A rigid body initially at rest will apply resistance when acted by an external force that tends to change its state of rest or velocity, or a body initially at motion will provide resistance in changing its state of velocity or motion for coming to a state of rest. In other words, Newton's first law of motion describes the law of inertia of a rigid body.