By Alain Haché
What do Wayne Gretzky and thermodynamics have in universal? much more than you could imagine. the sport the nationwide Hockey League calls " the good video game on earth" is usually a fast moving, dynamic exhibit of physics in action.
In The Physics of Hockey, physicist and novice hockey participant Alain Haché examines a number of the actual rules in the back of the world's hottest iciness staff recreation. What makes ice so slippery you could skate on it? how are you going to skate backwards such a lot quickly? How can physics increase your slapshot? Why perform a little collisions reason accidents yet no longer others? How does a Zamboni paintings? and the way do you arrange a natural, soft ice floor in Dallas while it's ninety levels outdoor and there are twenty thousand humans inside?
This is physics through a hockey fan for the hockey fan. Haché investigates the houses of the ice floor, the technological know-how of skating and of skates, the percentages of profitable and wasting streaks, and the rules at the back of taking pictures, hitting, and goaltending. relating themes reminiscent of solid-state physics, statistical physics elasticity, chance, thermodynamics, and mechanics, Haché makes use of technological know-how to augment our appreciation and knowing of the sport. The ebook is illustrated with photographs and graphs and punctuated with anecdotes to teach how well-known gamers, prior and current, are fairly physicists on skates.
A thought-provoking, enjoyable, and mild creation to a couple uncomplicated concerns in physics, The Physics of Hockey is a really distinct publication useful of the shelf of each hockey fan and physics enthusiast.
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Additional info for The Physics of Hockey
The amount of energy (heat) this force produces depends on the distance over which the rubbing takes place. When the blade, which contacts the ice over a length L, completely sweeps over a given point on the ice, it leaves behind the following amount of heat: E == fL == Jl mgL. 2) Now suppose that the ice absorbs roughly half the heat, while the rest is dissipated through the blade and elsewhere. As a result, the ice temperature will rise by an amount ~ T. By how much will it increase? According to the definition of heat capacity (noted as C), the temperature change also depends on the mass, given by p V, where p is the density and V the volume of the ice absorbing the heat.
This component is the only one that matters as far as forward propulsion is concerned. (Readers who are not familiar with the concept of a force component should refer to Appendix 3 for a discussion on how 43 Skating . . . 4. Leaning forward allows the leg to exert a greater amount of force. When a hockey player accelerates (or fights against air drag), his center of gravity (mg) moves ahead of the point of contact with the ice (where N is applied). ) Because ice friction is very small, the reaction force has virtually no component along the blade axis, as Fig.
1 shows an enlarged cross section of the blade and the arc-shaped groove along the blade axis. This groove is necessary to stabilize the skate in the lateral direction. Because of the small area underneath the blade and the large pressures exerted upon it (see the previous chapter), the sharp edges easily penetrate the ice, providing enough grip for a skater to stop on a dime, kick up a spray of ice, or accelerate quickly. Another way to look at it is to consider the skate as having a highly asymmetric coefficient of friction: it offers little resistance to forward or backward motion but a lot of resistance to the side.