restoring force; righting moment; stability
Technical term in physics and naval architecture: the force or moment that returns a displaced object (e.g., a ship, a spring) to its equilibrium position. 'Righting moment' is specific to ships; 'restoring force' is the general physics term.
The greater the ship's righting moment, the harder it is to capsize.
ばねの復元力は変位に比例する。
The restoring force of a spring is proportional to its displacement.