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Reference.org
Collision
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<p>In <a href="/facts/Physics/a7aH2y08">physics</a>, a collision is any event in which two or more bodies exert <a href="/facts/Force/533Q1uzq">forces</a> on each other in a relatively short time. Although the most common use of the word <i>collision</i> refers to incidents in which two or more objects collide with great force, the scientific use of the term implies nothing about the magnitude of the force. </p>