Force

Force is a push or pull that causes an object to move, stop, or change direction. It is an interaction between two objects, where one exerts influence on the other. For example, pushing a door open applies a force that moves the door. Force can also be due to gravity pulling objects downward or friction resisting movement. It's measured in units called newtons (N). In essence, force is what makes objects accelerate, decelerate, or deform, depending on its magnitude and direction.