Conservation of Momentum

Definition

The principle of conservation of momentum states that the total momentum of an isolated system remains constant if no external forces act on it.

Analogy

Think about a game of pool. When you hit the cue ball, it transfers its momentum to another ball, which then moves while the cue ball slows down or stops. Despite this change, the total amount of momentum (the speed and direction) within the game stays the same.

Related terms

Impulse: This is a measure of how much a force changes an object's motion. It's like giving a big push to start a swing moving.

Inelastic Collision: A type of collision in which kinetic energy is not conserved but momentum is conserved. It's like when two pieces of clay collide and stick together - they move as one after impact.

Elastic Collision: A type of collision where both kinetic energy and momentum are conserved. It's like when two billiard balls collide - they bounce off each other without losing any energy.