Which force is described as working against gravity on the human body?

The force that works against gravity on the human body is known as negative G force. When discussing G forces, it is essential to understand that they are relative measures of acceleration. Positive G forces occur when the body experiences acceleration in a direction that adds to the force of gravity, such as during rapid climbs in an aircraft or during a sudden increase in speed in a vehicle. In contrast, negative G forces are experienced when there is a rapid deceleration or movement away from the ground, effectively reducing the gravitational pull on the body. This can happen in situations like a steep descent or during certain aerial maneuvers, making the effect feel as though gravity has decreased momentarily.

In this context, negative G forces can lead to various physiological effects, such as the feeling of weightlessness or a sensation of lifting off the seat. This can impact blood circulation and other bodily functions due to the reduction of pressure exerted by gravity. Understanding negative G forces is crucial in aerospace physiology because it helps anticipate and mitigate the potential effects on pilots and crew members during flight maneuvers.