# 7: Linear Momentum and Collisions

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• Boundless
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• 7.1: Introduction
Linear momentum is the product of the mass and velocity of an object, it is conserved in elastic and inelastic collisions.
• 7.2: Conservation of Momentum
Net external forces (that are nonzero) change the total momentum of the system, while internal forces do not.
• 7.3: Collisions
In an inelastic collision the total kinetic energy after the collision is not equal to the total kinetic energy before the collision.
• 7.4: Rocket Propulsion
In rocket propulsion, matter is forcefully ejected from a system, producing an equal and opposite reaction on what remains.
• 7.5: Center of Mass
The position of COM is mass weighted average of the positions of particles.

Thumbnail: A pool break-off shot. (CC-SA-BY; No-w-ay).

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