Newton's Laws of Motion help us understand something called momentum in physics.

1. Newton’s First Law says that an object will stay still or keep moving at the same speed unless something else (a force) makes it change. This idea called inertia is linked to momentum. Momentum is found by multiplying an object's mass (how much stuff it has) by its speed ($p = mv$). If no force is acting on an object, its momentum stays the same.

2. Newton’s Second Law connects force to momentum. It tells us that the force acting on an object is equal to how quickly momentum changes ($F = \frac{dp}{dt}$). So, if we push (apply a force) on an object, its momentum will change over time.

3. Newton’s Third Law is all about action and reaction. It says that for every action, there is an equal and opposite reaction. This means when two objects bump into each other, the changes in their momentum are the same but in opposite directions. This is easy to see in elastic collisions, where momentum stays the same.

By learning these laws, we can understand how momentum works in different situations around us.