The law of conservation of momentum states that if no forces act on a group of objects, their total does not change.

The law of conservation of momentum states that if no external forces act on a group of objects, their total momentum does not change. This means that the combined momentum of the objects before any interaction must be the same as the combined momentum of the objects after the interaction.

Here are the steps to understand this concept:

1. Understand Momentum: Momentum is a vector quantity defined as the product of an object's mass and velocity. It is denoted by the letter 'p'. So, p = mv.

2. Understand External Forces: These are the forces that come from outside the system of objects you are considering. If no external forces act on the objects, then we can apply the law of conservation of momentum.

3. Understand the Law: The law of conservation of momentum states that the total momentum of a system of objects is constant if no external forces are acting on it. This means that the total momentum before any event (like a collision or explosion) is equal to the total momentum after the event.

4. Apply the Law: