Theorem of Conservation of Momentum

The theorem of conservation of momentum states that, in a closed system without external forces, the total momentum—the product of an object's mass and velocity—remains constant. This means that when objects collide or interact, they might change their individual velocities, but the overall momentum before and after the event stays the same. Essentially, momentum isn't lost or gained; it is conserved. This principle helps us understand and predict the outcomes of collisions and interactions in physics, ensuring the total motion energy is maintained unless an external force acts on the system.