G-Forces: What are they?

G-forces

G-force is an object's acceleration in proportion to free falling. Astronauts in space go through unusually g-forces (either low or high) in oppose to Planet Earth, where the force is 1g, or 9.8 meters per second squared.

A good example of g-forces are on roller coasters. When you go down a large drop, the g-force results in you getting pushed back in your seat. This is relative to planes, too, as you get pushed back in your seat during take off. The g-force is actually rotating at this time.