Inertial dampener

Inertial dampeners are devices used on spacecraft to counteract the affects of sudden movements on ships including acceleration, deceleration and sudden turns and probably lessen the shudder from taking weapon hits. The inertial dampeners are equipped on spaceships from seperate races.

Ancient
All ships in the ancient fleet are equipped with inertial dampeners. Puddle Jumpers are equipped with them, or the people on board would face lethal G-forces. They can apparently be adjusted. The dampeners uses up a considerable amount of power. In the fleet the dampeners should always be activated before the ships could even start moving.

Goa'uld
Goa'uld Ha'tak vessels are equipped with inertial dampeners, but can be inferior in effectiveness, including Apophis' and Klorel's Ha'tak vessels, at least to humans.

Tau'ri
All F-302s are equipped with inertial dampeners, but the pilots can still experience the affects of sudden movements. All Tau'ri vessels are most likely equipped with inertial dampeners