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Center of Mass
The point at which a given net force acting on the system will produce the same acceleration as if all the mass were concentrated at that point.
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Impulse
A force applied over a period of time. See definition of impulse.
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Momentum
The product of an object's mass and velocity. See definition of momentum.
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Conservation of Momentum
The principle stating that for any system with no external forces acting on it, momentum will be conserved.
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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