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Collision
The brief direct contact between two bodies that results in a net impulse on each body.
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Elastic Collision
Any collision in which kinetic energy is conserved.
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Inelastic Collision
Any collision in which kinetic energy is not conserved.
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Completely Inelastic Collision
Any collision in which the two bodies stick together.
Terms
Formulae
| Position of the center of mass of a system of particles | xcm =   mnxn |
| Velocity of the center of mass of a system of particles | vcm = mnvn |
| Acceleration of the center of mass of a system of particles | acm = mnan |
| Acceleration of the center of mass of a system of particles given an external force | Fext = Macm |
| Definition of Impulse | J = FΔt |
| Change in velocity caused by an impulse | J = mvf - mvo |
| Definition of momentum | p = mv |
| Relation between force and momentum |  = F |
| Impulse-Momentum Theorem | J = Δp |
| Definition of the linear momentum of a system of particles | P = Mvcm |
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