Momentum is the amount of mass moving, which can be written as the product of the mass and velocity of an object.
In general the momentum of an object can be thought of as the tendency of an object to continue to move in its direction of travel, unless acted on by a net external force. As such, it is a natural consequence of Newton's laws of motion.
Momentum is a conserved quantity, meaning that the total momentum of any closed system (one not affected by external forces) cannot be changed.
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