When a large fish swims into and swallows a smaller fish, this same momentum of something like the two-fish system is increased. Nothing has changed.
Momentum is defined as the product of a particle's mass and velocity. Momentum is an vector quantity, meaning means that it has both a magnitude and a direction.. According to Isaac Newton's second equation of motion, the time rate at which the momentum changes equals the force applied on the particle. Look up Newton's laws of motion.
Momentum in Physics is significant because that describes the link between speed, mass, and direction. It also describes overall force required to stop and keep items moving. If an object seems to have enough momentum, it really can exert considerable force.
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