Shooting the puck

Shooting the puck in hockey has the most physics.  There are lots of transfer of energy, friction energy, and using the flex of the stick.  Flex is a measurement of how strong the stick is.  It determinds how much force can be pressed down before the stick breaks.  Higher the flex, higher pressure it can handle.  In this year NHL all stars event, Zdneo Chara had the fastest slap shot in NHL, with the record of 105.9 MPH.  Its amazing how fast they can shoot the puck.  There are lots of physics behind getting the puck as fast as 105.9 MPH. 


Most of the power comes from bending of the stick.  As a player gets ready for a slap shot, they swing back to get as much momentum as they can when hitting the ice.  As they swing foward, the weight of the player transfers from back leg to the front leg and also the stick.  As the weight pushes the stick down, it uses the flex of the stick.  With the release of the bend, and the foward momentum of the stick, when it hits the puck, the energy and the momentum is transferred into the puck, making the puck move as fast as it does.  There are also friction of the stick when the blade of the stick makes contact with the ice. 



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