What does Newton's 3rd Law describe about the relationship between forces?

Newton's 3rd Law states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object exerts a force of equal magnitude but in the opposite direction back on the first object. This relationship shows that forces are inherently reciprocal, demonstrating that they always occur in pairs.

For example, if a person pushes against a wall, the wall pushes back with equal force. This concept is fundamental in understanding interactions in physics, as it emphasizes that forces do not exist in isolation; they always come in pairs. The equality of the forces in magnitude and the opposition in direction are crucial characteristics outlined by this law, making it a cornerstone of classical mechanics.