# Why does a spinning ice skater’s angular velocity increases as she brings her arms in toward her body?

**Contents**hide

## Why does a spinning ice skater’s angular velocity increases as she brings her arms in toward her body?

When she moves her arms close to her body, she spins faster. Her moment of inertia decreases, so her angular velocity must increase to keep the angular momentum constant.

## Why is it harder for an ice skater to spin with his arms stuck out as opposed to tucked in?

Moment of inertia depends on both the mass of an object and on how that mass is distributed. The farther from the axis of rotation the mass is located, the larger the moment of inertia. So your moment of inertia is smaller when your arms are held at your sides and larger when your arms are extended straight out.

## Why do skaters spin faster when they pull in their arms?

The principle of the conservation of angular momentum holds that an object’s angular momentum will stay the same unless acted upon by an outside force. This explains why a figure skater spins faster when she tucks her arms in close to her body.

## What happens to the moment of inertia of a figure skater as she extends her arms away from her body?

For example, when the skater extends her arms outwards, increasing twofold the moment of inertia, the velocity of her spin also decreases twofold. While tucking her arms in, she decreases the moment of inertia significantly and thus gains high rotational velocity.

## When an ice skater spins and increases her rotation rate by pulling her arms and leg in what happens to her rotational kinetic energy?

Her angular momentum is conserved because the net torque on her is negligibly small. In the next image, her rate of spin increases greatly when she pulls in her arms, decreasing her moment of inertia. The work she does to pull in her arms results in an increase in rotational kinetic energy.

## Why does the ice skater twirls faster and faster as she retracts her arms closer to her body?

When the hands and legs are brought close to the rotational axis, the rotational inertia decreases thereby increasing the skaters angular velocity as per the conservation of angular momentum. Increase in angular velocity implies increase in the kinetic energy.

## What will happen if an ice skater spinning on one foot extends her arms?

By extending her arms and one leg, a figure skater can increase her moment of inertia. By pulling her arms and legs close to her body, she can decrease her moment of inertia. The figure skater’s angular momentum must re- main constant according to the law of conservation of angular momentum.

## Why do ice skaters tuck their arms?

## When an ice skater pulls in her initially outstretched arms while spinning on point does she change her angular momentum?

As the ice skater draws her arms in, the moment of inertia with respect to the axis decreases. Therefore in order to conserve the angular momentum the angular velocity has to increase.

## Why do skaters bend their knees?

More knee bend (flexion) allows your centre of gravity (CoG) to be lower (increasing your balance), while providing you the potential for a longer stride resulting in more power.

## What is a spin on ice called?

Figure skating element There are two types of spins, the forward spin and the backward spin. There are three basic spin positions: the upright spin, the sit spin, and the camel spin. Skaters also perform flying spins and combination spins.

## Why an ice skater stretches out arms and legs during performance?

During the course of their performance, an ice skater, a ballet dance or an acrobat take angular of the principle of conservation of angular momentum (i.e Iω= constant), by stretching out arms and legs or vice-versa. On doing so, their moment of inertia increases/decreases.

## What happens to her angular speed when she pulls her arms in?

When she pulls her arms in, her rotational inertia is reduced. Since there is no external net torque on the ice skater, her angular momentum remains constant because her angular velocity magnitude increases.

## What happens a spinning ice skater draws in her outstretched arm?

As the ice skater draws her arms in, the moment of inertia with respect to the axis decreases. Therefore in order to conserve the angular momentum the angular velocity has to increase.

## How does an ice skater very her angular speed by out stretching her arms and legs?

When the performer stretches out his hands and legs, his moment of inertia increases and the angular speed decreases. On the other hand, when he folds his hands and the legs near his body, the moment of inertia decreases and he is able to increase the angular speed.