The conservation of momentum

The conservation of momentum means that in a closed system where no external forces act, the total momentum before any interaction equals the total momentum afterward. Momentum is a measure of how much motion an object has, calculated by multiplying its mass by its velocity. For example, if two cars collide on a highway, the combined momentum they have before the crash is the same as after, just redistributed between them. This principle helps us understand and predict the outcomes of collisions and interactions in physics, ensuring the total motion remains constant unless acted upon by outside forces.