But gravity isn't the only force on skydivers Mir friction, or drag, pushes up on their bodies as they fall through the air. ("Drag" is another word for the force of friction between the skydiver and the air.) The force of gravity is constant, but drag increases with the skydiver's speed. As skydivers fall, they eventually reach the point where the size of the drag force "equals the size of the force of gravity. The drag continues to push up while gravity continues to pull down. But now, the two forces counterbalance each other. As a result, skydivers fall at a constant selocity
terminal velocity.