Collision

comet

alt=A 3D simulation demonstrating collision with a ball knocking over some blocks.|thumb|A 3D simulation demonstrating a collision with a ball knocking over a bunch of blocks In physics, a collision is any event in which two or more bodies exert forces on each other in a relatively short time. Although the most common use of the word collision 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.

fairground game/ride

collision in which kinetic energy is conserved and not dissipated

collision where energy is lost to heat, so that kinetic energy is not conserved

type of ammunition designed to penetrate vehicle armour

Orbit to planetary surface attack with inert projectiles

high force or shock applied over a short time period when two or more bodies collide

change in an object's velocity as a consequence of collision with a surface

thumb|The "energy flash" of a hypervelocity impact during a laboratory simulation of what happens when a piece of orbital debris hits a spacecraft in orbit thumb|The aftermath of a hypervelocity impact, with a projectile the same size as the one that impacted for scale