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Why does a spinning ice skater pull her arms close and extend them?
Wiki User
∙ 14y ago
A skater will pull his/her arms in close to their body while spinning to increase the speed and force of the spin in routines this also helps to improve the fluency of the routine and is able to keep going in time to the music. They extend their arms to improve the look of the spin within a performance or routine
hope this answered your question :)
Wiki User
∙ 14y ago
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Does the dorsal musculature of the body act to extend joints?
Yes, the doral musculature of the body acts to extend joints. For instance, the triceps extends the arms, and the paraspinal muscles extend the spine.
What allows you to flex and extend your lower leg and upper arms?
flexing is tightening of your muscles, and joints bend to let you extend your arm from the elbow and shoulder
What galaxy arms extend from a core full of black holes?
Such a galaxy is called a spiral galaxy.
Which galaxy arms extend from a core full of black holes?
The Milky Way appears to have a huge (even for a black hole) gravitational object at the center of it, and this is supposed by a lot of scientists to be a black hole. The arms of our galaxy sweep around the center.
What does a planets rotation cause?
This is a very good question that may not have an ultimate answer, but there is an explanation. The reason a planet rotates is due to its origins from the nebula from which it formed. This nebula had to be rotating. You probably have heard about the gyroscope and how it works- conservation of angular momentum. Angular momentum is determined by the rate of rotation and the mass of the object and its distribution as a function of distance from the axis of rotation. This is the principle behind an ice-skater spinning up when the arms are brought close to the body, or slowing down when the arms are extended. Except for dissipation and action of other torques, angular momentum is held constant. Thus the rotation of the gases and dust from which a planet formed causes the planet to keep on rotating, to conserve the initial angular momentum.The planet's rotation is of course changed by events both inside and outside of the planet. For example, it has been recently shown that the use of dams has changed the distribution of stored water on earth at different latitudes, sufficiently to change the length of the day! The difference is small, but has been detectable.But, why is the angular momentum conserved? And why was the nebula rotating if the universe began in a big bang?
When a spinning skater pulls in her arms to turn fasterher angular momentum?
The reason a skater spins faster when she pulls her arms in is because of angular momentum. It is measured by mass x velocity x radius. Bringing her arms in changes her radius and velocity.
Why an ice skater extend her arms when she wants to slow down and crosses her arms when she wants to speed up?
Extending her arms creates greater air resistance, causing a greater amount of force slowing her down. Crossing her arms reduced this air resistance, lessening the force slowing her down.
Which has greater rotational speed the shoulders or the fingertips of a figure skater spinning with her arms held straight out?
Rotational speed (degrees per sec) is the same, linear speed is greater at the finger tips.
How does a figure skater spin fast?
pull arms close to your bodykeep a 'secure' position (don't make your body 'loose')skate faster into the spinpractice
Why are tornadoes so violent?
Tornadoes develop wind the rotating updraft of a thunderstorm, called a mesocyclone, tightens into a smaller circulation. Just as a spinning ice skater speeds up when she pulls in her arms, so does the vortex of air as it narrows.
Why is a tornado fast?
Tornadoes owe their extremely fast winds in part to something called the conservation of angular momentum. If something that is rotation contracts in width then the spinning must speed up, such as with a spinning ice skater pulling in her arms. Tornadoes form when a larger but less intense mass of rotating air tightens and intensifies.
What happens to the angular speed of a star as it shrinks?
It must spin faster in order to conserve angular momentum ... the same reason that a skater spins faster when he pulls his arms in close to his body.
Which of these would you expect to produce the most centrifugal force A spinning arms slowly B spinning forearms arms slowly with biceps tightly at sides C swinging arms fast in circles with arms out?
swinging your arms around in circles very quickly
Why does spinning with your arms out make you go slower?
gravity slows your body by swinging your arms
If a figure skater is spinning with her arms outstretched why will she spin faster if she brings her arms in?
The answer is related to the conservation of angular momentum. A figure skater will maintain approximately the same angular momentum during their spin (minus a negligible amount due to the friction of their skates and wind resistance). When they move their arms in, they will reduce their rotational inertia by reducing the distance of the mass of her arms and hands from the axis of rotation. In order to maintain the same angular momentum, angular rotation is increased. See the link. Its called the angular conservation of energy. No matter what the skater's position the skater produces a certain amount of energy per second. When his / her hands are extended the distance of the rotation is larger. When he pulls his hands in the weight is unchanged. TO keep the energy at the same amount the difference has to be made up by increasing the number of spins per time unit.
Why pulling your arms in causes you to go faster?
When you are spinning there is a force called angular momentum that keeps you spinning and the angular momentum forms a ratio with the size of the object that is spinning so as you bring your arms inward, your size decreases increasing your angular momentum which spins you faster.
Do push ups extend your arms?
The exercise can help build muscles in your arms, but it does not make them longer.
