👉 In physics, a coalescing is an event where two or more objects combine to form another object. This occurs when one of the objects approaches and collides with another object in such a way that their centers of mass are coincident. The process can be described by Newton's third law, which states that for every action there is an equal and opposite reaction. For example, if two balls collide head-on, they will stick together due to the force of attraction between them. This is known