Physics Of Slap Shots
In the slapshot, players can clock puck speeds of over 100 miles per hour, making it the hardest shot in hockey.
Next, the player violently strikes the ice slightly behind the puck, and uses his weight to bend the stick, storing energy in it like a spring. When the face of the blade strikes the puck the player rotates his wrists and shifts his weight in order to release this stored energy and transfer it to the puck. The result is the puck reaching a speed faster than it would if the player simply hit the puck directly. The kinetic energy of the puck after impact is equal to the stored energy in the hockey stick.
the physics taking place here is the transfer of energy from player to stick, and from stick to puck.