An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his moment of inertia about the axis of rotation

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12-07-2022
Physics

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An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his moment of inertia about the axis of rotation

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simarahluwaliasimar simarahluwaliasimar · Answer 1 · 2022-07-23T18:55:49+02:00

Moment of inertia decreases about the axis of rotation.

The term "moment of inertia" refers to the quantity that describes how a body resists angular acceleration and is calculated by multiplying each particle's mass by its square of distance from the rotational axis.

Means,

I=mr² where,

I= Moment of inertia

m= mass of particle

r= distance of the particle from the axis of rotation.

So, Moment of inertia is directly proportional to the square of the distance from the axis of rotation.

I ∝ r²

As the distance of body from the axis of rotation increases, moment of inertia also increases and vice versa.

So, that's why when an ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body , then he/she will decrease his/her distance from the axis of rotation.

That's why moment of inertia decreases about the axis of rotation.

Learn more about Moment of Inertia here https://brainly.com/question/3406242

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