Newton's Third Law - GCSE Physics Definition

Newton's Third Law is one of the basic ideas in physics, and it helps us understand how forces work between two objects. It says that for every action, there's an equal and opposite reaction. This means that when one object pushes or pulls on another object, the second object pushes or pulls back with the same amount of force, but in the opposite direction. For example, if you were to push a wall, the wall pushes back on you just as hard. This law helps us understand why we can move and how things like rockets and cars work. It's all about how forces act in pairs and affect each other.