Gravity is a global setting that is applied to all physics systems in a scene. It can be found in the scene tab. This value is generally fine left at its default, -9.810 on the Z axis, which is the force of gravity in the real world. Changing this value would simulate a lower or higher force of gravity. Gravity denoted g, measurement m × s-2.
Gravity is applied in the same way to all physics systems.
Gravity is practically the same around the entirety of planet Earth. For rendering scenes on The Moon, use -1.622 m × s-2 on the Z axis. Another popular gravity value might be for Mars which has a gravitation acceleration of -3.69 m × s-2 on the Z Axis.
The gravity value per physics system can be scaled down in the Field Weights tab.