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# Physics Project

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## Cailyn Leslie

on 26 February 2013

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#### Transcript of Physics Project

Created By:
Cailyn Leslie Physics Project The Physics
of
Figure Skating Whenever a skater spins, they are spinning around an imaginary axis of rotation. This is known as torque. The typical rotation speed is two revolutions per second, but skaters can also spin up to 24 revolutions per second with their arms and legs pulled in. Spins Newton's First Law of
Motion "An object at rest or in
motion tends to stay at
rest or in motion until an
outside force interacts
with it." Newton's Second Law of
Motion "The force (F) acting on an object
is equivelant to the product of
its mass (m) and acceleration (a)." Rotation Bibliography Figure Skating Physics F = ma Newton's Third Law of
Motion "For every action, there is an
equal and opposite reaction." Ex: A skater will keep gliding on the ice until friction (the outside force) eventually allows them to come to a stop. Ex: Let's say a skater weighs 54 kg. And her acceleration is 3 m/s squared. If we multiply these [54 * 3] we get 162. This means that the force acting on her is 162 N. (That's not the net force though.) Ex: When a skater pushes back and down on the ice with their foot, they move forward - an opposite reaction. when a skater extends her arms and one of her legs, she spins slower because she is distributing her mass outward instead of keeping it all close to her body. when a skater pulls her arms and legs in, she spins faster to keep her momentum constant. leaps in figure skating require the skater to convert the linear momentum into vertical momentum. in order to achieve a higher and longer jump, the skater has to accelerate into the jump. to land, they extend their arms and one leg - similar to when they are spinning. Hokin, Samuel. "The Physics of Everyday Stuff - Figure Skating Spins." BSHarp.org. N.p., n.d. Web. 29 Jan. 2013. "The Free Automatic Bibliography and Citation Maker." EasyBib.com. N.p., n.d. Web. 29 Jan. 2013. "The Physics of Figure Skating." LiveScience.com. N.p., n.d. Web. 29 Jan. 2013. "The Physics Of Ice Skating." RealWorldPhysicsProblems.com. N.p., n.d. Web. 29 Jan. 2013. The heavier the skater weighs, the more inertia they have. So the more inertia they have, the more force is needed to accelerate them and keep them gliding across the ice. Now, gliding across the ice isn't that hard since there is almost zero friction between the blade and the ice. But friction is still important; it is what allows a skater to ever come to a stop.
But to even get moving, a skater has to "stroke" the ice with their skates. Pushing down and back on the ice, the ice just pushes up forward causing them to move.
To speed up, all the skater has to do is use more force to overcome their inertia and stroke faster. "Types of Friction." Physics.TutorVista.com. N.p., n.d. Web. 03 Feb. 2013. Block 4 http://www.olympic.org/figure-skating Leaps •Glencoe Science. "Introduction to Physical Science." McGraw-Hill Companies Inc., 2005. Web. 19 Feb. 2013.
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