Hockey and Physics

Ice hockey is one sport that has the widest array of physics elements in it. One of the most exciting events in hockey is the slapshot. The hockey players use this technique to send a puck flying through the air at over 150 km/h or more. The slapshot is a collision between the puck and the hockey stick. The upper body has to wind up and begin an acceleration of the middle of the body, shoulers, and arms. Then the stick black comes into contact with the puck and the ice, causing the stick to bend accumulate potential energy. Finally, the puck leaves the stick and returns to its origanal shape as the puck heads towards the net. The scientist assume the collision to be an elastic collision with the stick and the hockey player, and the puck. The is plenty of elasticity in the stick to make it a fair approximation. Iwi=Iwf + rmv, where I, wi, and wf are the moment of inertia of the player and stick system, and its angular velocity just before and after the collision. The puck of mass lies at a distance of the axis of rotation of the player and leave with a velocity. The puck speed is proportional to the spinning velocity of the player. The larger I is, the faster the slapshot, and this is where body mass and positioning come into play. In the limit when I mr^2, the puck reaches a max velocity of v=2wir. The speed limit as close to that of what occurs in linear collisions. The trick to getting the speed on a slapshot would be the ice. The stick must hit the ice and glide on the ice before hitting the puck. The thing is to hit the ice with the stick about thirty centimeters away from the puck. The outcome is more bending of the stick and more power to the puck. The player pushes against the ice to let the stick bend, and then they let the stick do the rest of the work. Hockey is the fastest and most contact sport in the world. Hockey players complete a lap around the rink in about fourteen seconds starting from rest. They are getting an average velocity of forty km/hr. Though rarely happening at maximum speed, collisions send significant impact forces to the body. In the collision the amount of kinetic energy used is the factor determining the impact force and injury to the player. Hockey is a very contact sport. Scientist have found equations and ways to figure out the forces of hockey. Hockey is a sport where potential energy is turned into kinetic energy.

Too Good to Play

A nine-year old Connecticut boy was banned from pitching on his little league baseball team because the oppositions said he was too good.One team went as far as to forfeit the game when he took the mound. A pitch was never thrown. This to me is showing the other kids how to quit and not work hard to beat the kid. Many people see competition as a challenge and try to work harder at beating the competition, not quitting. It's sad the kid cant use his talent at his young age. The more successful one becomes, the more confidence they build up for the future.
http://www.chinadaily.com.cn/life/2008-08/26/content_6970889.htm

Cell Phones Harmful?

Cell phones have become a part of the body for some, but now they may become harmful to the body. Many people are taking precautions these days with using cell phones due to the analysis of USPMC Cancer Centers. It is said that the long term use of cell phones may cause cancer. We thought texting while driving was bad, it is nothing compared to cancer. One way to limit this is keeping a device away from the head and using text messages more often. The cell phone will never be banned I believe, it is a part of too many people's lives. Companies are just gonna have to make adjustments to the devices.
http://www.post-gazette.com/pg/08205/898803-114.stm