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In physics, collision means the action of bodies striking or coming together (touching).

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Collisions involve forces (there is a change in velocity). Collisions can be elastic, meaning they conserve energy and momentum, inelastic, meaning they conserve momentum but not energy, or totally inelastic (or plastic), meaning they conserve momentum and the two objects stick together.

The magnitude of the velocity difference at impact is called the closing speed.

The field of dynamics is concerned with moving and colliding objects.

In billiards, collisions play an important role. Because the collisions between billiard balls are nearly elastic, and the balls roll on a low-friction surface, their predictable behaviour is often used to illustrate Newton's laws of motion.


 
  Bronco rushed to hospital after helmet collision
Denver Broncos linebacker Warrick Holdman was carted off the field and taken by ambulance to a hospital Thursday after he appeared to injure his head or neck.There was no immediate word on the extent of his injury, although he was ...
http://sports.originalsignal.com/article..

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  Cyclist killed in collision with vehicle
Cyclist killed in collision with vehicle A 33-year-old Fairbanks man died after a Honda Civic struck him as he rode across the intersection of University Avenue and Geist Road on his bicycle late
http://newsminer.com/2007/08/02/8236

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1. Be Car Care Aware
Tips on choosing a collision repair business. ... When Accidents Happen Are You Prepared? Choosing a Quality Collision Repair Business
http://www.carcare.org/collision.shtml

2. Arizona Collision Craftsmen's Association
- Member shops displaying our logo are able to repair your accident-damaged vehicle with the latest in training, techniques, equipment and materials.
http://www.az-cca.com/

3. Collision - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/Collision

4. Comet Shoemaker-Levy Home Page (JPL)

http://www2.jpl.nasa.gov/sl9/sl9.html

5. Cosmic Collisions | American Museum of Natural History

http://www.amnh.org/rose/spaceshow/cosmi..

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