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The Physics of Ice Skates
Newton's Third Law

Newton's third law states that for each action, there is an equal and opposite reaction. In the case of ice skating, this means that in order for the skater to be propelled forward their skate's blade must be at an angle which is relative to their own direction of motion.

angle
                      of skate

- http://www.real-world-physics-problems.com

To propel forward with greater force the ice skater must simply enlarge the angle of their skate which will in turn increase the force component in the direction of motion.
Design

The design of a hockey skate is tailor made to provide both stopping and turning maneuverability as well as rapid acceleration, all on ice.

blade

- http://www.iceskatingintnl.com

The fantastic versatility of the skate blade is accomplished by hallowing out the bottom to create two sharp edges. These edges are what provide the great maneuverability and stability associated with modern day skates.