When an ice skater who is doing a spin pulls her arms in?

If a figure skater starts spinning slowly with her arms and possibly one leg extended, she initially has a high moment of inertia and a low angular velocity. If she pulls her arms and leg in closer to her rotational axis, her moment of inertia decreases.

If a figure skater starts spinning slowly with her arms and possibly one leg extended, she initially has a high moment of inertia and a low angular velocity. If she pulls her arms and leg in closer to her rotational axis, her moment of inertia decreases.

When an ice skater who is doing a spin pulls her arms in her angular momentum?

Figure 11.14 (a) An ice skater is spinning on the tip of her skate with her arms extended. Her angular momentum is conserved because the net torque on her is negligibly small. (b) Her rate of spin increases greatly when she pulls in her arms, decreasing her moment of inertia.

What happens when an ice skater pulls their arms in?

If you're initially rotating with your arms outstretched, then when you draw your arms inward, your moment of inertia decreases. This means that your angular velocity must increase, and you spin faster.

What happens when a spinning ice skater draws in their outstretched arms?

Her angular momentum increases. Her moment of inertia decreases causing her to speed upHer moment of inertia decreases causing her to slow down.

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

Closed 1 year ago. There is a classic example that a spinning skater pulls his arms back. The angular momentum is conserved, the moment of inertia decreases. And therefore, it's angular velocity increases, so the rotational kinetic energy will increase.

44 related questions found

Is skater wants to increase the rate of spin?

A spinning ice skater can increase his rate of rotation by bringing his arms and free leg closer to his body.

Why does an ice skater spin faster when she pulls her arms in close to her body?

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 her rotational kinetic energy when she pulls her arms in?

The work she does to pull in her arms results in an increase in rotational kinetic energy.

Why does a skater spin faster when they pull in their arms and legs quizlet?

When a figure skater draws her arms and a leg inward, she reduces the distance between the axis of rotation and some of her mass, reducing her moment of inertia. Since angular momentum is conserved, her rotational velocity must increase to compensate.

What will happen if an ice skater spinning on one foot extend 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.

Which quantity does not change when an ice skater pulls in her arms during a spin?

If angular momentum is conserved, how does an ice skater ever stop spinning? A gyroscope is a wheel or disk that spins rapidly around two or more axes. The law of conservation of angular momentum states that if no external force acts on an object, then its angular momentum does not change.

When an ice skater extends her arms while spinning and slows down this best explanation?

But a skater can change one thing: the moment of inertia. Moment of inertia determines how easy it is for an object to speed up or slow down, and describes the resistance that a force is working against. A larger moment of inertia—like when a skater extends their arms—will result in a slower rotational speed.

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

conservation of angular momentum: her moment of inertia is decreased, and so her angular speed must increase to conserve angular momentum. An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body.

What happens to her angular speed when she stretches her arms?

Answer: When the girl stretches her arm, according to a law of conservation of angular momentum the distance from the axis of rotation increases and so a moment of inertia increases and thereby angular speed decreases.

Why does a figure skater spin faster when she has her arms closer to her chest and spin slower when she has her arms stretched outwards?

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 is meant by the lever arm of a torque?

What is it meant by the "lever arm" of a torque? It is the perpendicular distance from the rotational axis to the line along which the force acts.

Which position of the broom is easier to rotate?

Justification: Because with the heavier weight of the broom father away from your hand, this gives the broom more rotational inertia. This prevents the broom from rotating off your finger as easily, because it has more of the property to resist change.

What does rotational kinetic energy depend on?

Rotational kinetic energy depends on: How fast the object is spinning (faster spinning means more energy). How much mass the spinning object has (more massive means more energy). Where the mass is located compared to the spin (objects farther from the spinning axis have more rotational kinetic energy).

How can an ice skater increase his/her spinning speed?

A spinning ice skater can increase his rate of rotation by bringing his arms and free leg closer to his body.

Why does rotational kinetic energy increase?

When the angular velocity of a spinning wheel doubles, its kinetic energy increases by a factor of four. When an object has translational as well as rotational motion, we can look at the motion of the center of mass and the motion about the center of mass separately.

How do ice skaters spin so fast without getting dizzy?

When our head rotation triggers this automatic, repetitive eye movement, called nystagmus, we get dizzy. Skaters suppress the dizziness by learning how to counteract nystagmus with another type of eye movement, called optokinetic nystagmus.

Why do you spin faster when you pull your legs in?

With their limbs pulled into their body, their momentum is conserved and they spin faster than with their arms extended.

How do ice skaters spin?

The skater rotates around the point at which the blade touches the ice, the most important point in the vertical axis made by the skater's body, and a fixed vertical axis that extends from the blade on the ice to the highest point in his or her body.

Why does the skater starts her rotation with outstretched limbs and increases her spin by pulling them in toward her body?

A figure skater spins, with her arms outstretched, with angular velocity of ωi. 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.

What does the skater physically do to make themselves spin faster or slower?

When a skater performs a dazzling spin, they control their rotational speed by pulling their arms in to decrease the moment of inertia and speed up rotation or spreading them out to decrease moment of inertia and slow rotation.

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