The maximum total force exerted on an astronaut by her seat during the launch of a space shuttle is about 3gs.
The weight of the cargo a rocket is carrying determines how much g-force it can generate. A manned mission is constrained by what a human being can withstand. High g-forces can harm the body, and at about 9 gs, most people pass out as their blood struggles to get to their brains. During a rocket launch, astronauts typically feel a maximum g-force of about 3gs. The force of gravity is equivalent to three times what people ordinarily experience on Earth, but the passengers can withstand it. Astronauts undergo high-g training, don g-suits, and need to be properly outfitted.
When a mass accelerates, there is a force (F=ma). While moving at any speed, there is no inherent force that is perceived. Whenever velocity changes, force is sensed. Since the definition of acceleration is the change in velocity over time (dv/dt), we can rewrite the force equation as F=m(dv/dt).
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