Presentation on theme: "Brandon Ng 3o3(03). Also known as Artistic Skating Olympic sport Perform spins,jumps and intricate footwork on ice Watch an example of figure skating."— Presentation transcript:
Also known as Artistic Skating Olympic sport Perform spins,jumps and intricate footwork on ice Watch an example of figure skating herehere 2010 Winter Olympics Champion : Kim Yuna
Singles Pair skating Ice dancing Synchronized skating Adagio skating A form of pair skating Acrobatic skating Combination of circus arts, artistic gymnastics skills Special figures Elaborate original designs on ice
Made of many layers of leather Very stiff to provide ankle support Toe picks on the front of blade Used for certain jumps Blades are sharp to reduce friction, increasing speed Newton’s law of inertia
Ice is not slippery When skating, one is skating on water in its liquid form Ice melts when pressure is applied to it The greater the pressure on a substance, the lower its freezing point
A person’s weight is unable to melt ice under them However, the sharp skate blade of the ice skates puts the weight of the skater on a small area Allows skater to glide on a layer of water between the blade and the ice
Travelling at speeds around 20mph Completing four revolutions in the air Land on one leg Unable to defy gravity or laws of physics Most people can barely jump high enough to make one revolution without touching the ground
Torque Force that leads to rotation Linear motion Motion along a straight line Angular momentum A conserved vector quantity that can be used to describe the overall state of a physical system Vorticity A concept describing horizontal rotation In the atmosphere
Skate moves without falling down Angular momentum helps stabilize the moving body, just like someone riding a bicycle Skaters spread their arms then bring their hands closer to their bodies Causing a large moment of inertia Speed of spinning increases
Spinning is also dependent on torque Force must be applied some distance from the axis of rotation ie. If I push a stationary person’s arms, he can spin, but if I push the middle of his body, he will barely move Force is achieved by pushing the ice Newton’s law of action-reaction forces Multiple spins are accomplished with the result from the torque created by turning of one’s skates as one pushes off the ice
The larger or further the force is from the axis of rotation, the larger the torque The larger the torque, the greater the angular momentum, the more spins made Some skaters can reach rotation speeds of 7 revolutions during a jump, 420 revolutions per minute!
Rotational speed increased by pulling in their hands closer to body Reduces air resistance Streches out their hands and legs for stability while landing Skaters can produce extreme angular momentum at take-off, that they might not be physically strong enough to counteract the G-forces experienced during the rotation. The G-force felt by the arms during a jump or spin may exceed 4Gs!