|MadSci Network: Physics|
Momentum is the concept you are looking for. The following web reference, found with a search for the term momentum describes momentum. http://encarta.msn.com/find/Concise.asp?z=1&pg=2&ti=761554136 Momentum is the product of mass and velocity. When you try to tackle a running football player, the player's momentum is directly proportional to their mass. The more massive, the more momentum, more player's running at the same velocity. Since the momentum is simply a product of mass and velocity, a more massive player is easier to tackle before they get up to speed. If you are a really light but fast tackle, you might also suspect it possible to upset a heavier player by tackling from the rear. Most high school physics textbooks include a more complete discussion of momentum. Thanks for your question. sid
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