Having played field hockey for much of my
life, I never really thought about why field hockey sticks are so stiff
compared to ice hockey sticks and what implication this has on shooting in both
sports. The fundamentals of physics suggest that the ball velocity of a field
hockey shot is created slightly differently than the puck velocity of an ice
hockey shot.
Since field hockey sticks are so hard and
stiff, the stick is minimally flexed before it makes contact with the ball.
When hit, a field hockey ball gains its velocity predominantly by the kinetic
energy created as the player accelerates the stick. A large force is exerted
on the ball and momentum is transferred from the stick to the ball.
However, in ice hockey, the puck velocity on
a shot is created through kinetic energy and elastic potential energy. While
the puck gains velocity through kinetic energy in a similar mechanism as a
field hockey ball, a puck gains additional velocity through the release of
potential energy that is stored when the hockey stick is flexed against the
ice. The momentum created by the velocity of the moving hockey stick and the
release of the stick flex is transferred from the stick to the puck and
determines the velocity of an ice hockey shot.
Another reason why ice hockey is a much faster paced sport is because of the friction involved. Field hockey is commonly played on grass turf,
which, compared to ice, is much rougher. Assuming hockey pucks and field hockey
balls are made of the same type of plastic, the coefficient of friction for the
between the turf and ball is much greater than that between the ice and puck. Thus,
if one was the apply the same amount of force to both the puck and ball, the
puck would travel much farther. This is why the field hockey turf is watered at
the beginning of the game and a halftime, as water helps to reduce the friction
between the ball and turf.
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