G force is the gravity force. When you go up on a swing and at the highest point you feel weightless, that is negative g force. When you are in one of those rides that makes you feel super heavy (or...
G-forces can make it difficult for blood to reach your brain. Conversly, they can also force blood to your head. In either case, pain, dizziness and nausea can occur. If the g-forces are extreme they...