Where The Energy Comes From
Flexability
The idea is simple, swing the stick, and slap the puck, but behind the scenes we see two different types of energy in action.
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http://howtohockey.com/how-to-take-a-snapshot-in-hockey/
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https://www.hockeyshot.com/shooting-tips/four-types-of-shots
https://www.smm.org/hockey
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Kinetic Energy
 https://www.si.com/nhl/home-ice/2013/09/10/can-kickstarter-help-colt-create-the-unbreakable-hockey-stick
Players can utilize the kinetic energy of an already moving stick to strike a puck and propel it forward. This is similar is relation to a golf club hitting a ball. In this instance we see energy and momentum from the players stick become energy and momentum propelling the puck forward. This is the least effective of the two types of energy because the larger force of the player's body is being used to propel such a small and light object.
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Elastic Energy
This is the most effect source of energy out of the two types. This requires the stick to be bent without acceleration so that elastic energy can be stored within the stick. This can be done by pushing the stick against the ice. The sudden release of energy when the stick slides across the nearly frictionless surface launches the puck forward with great velocity. The elastic energy is transferred into kinetic energy. Goalies like potential energy, not kinetic energy.MA
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