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What is the law of conservation of momentum?
The total momentum of a system remains constant provided no external forces act on the system.
What is meant by a closed system?
A system in which no external forces act.
When is momentum conserved?
During collisions and explosions, provided the system is closed.
Why must direction be considered when calculating momentum?
Because momentum is a vector quantity.
What happens to momentum before and after a collision in a closed system?
The total momentum before the collision is equal to the total momentum after the collision.