– Very simple parameter, it only defines the mass of the object.
– It is expressed in Kilograms

– In this example two rigid bodies fall on a rotating seesaw. Note how the two masses are balanced on the seesaw only when they have equal masses.
– Why the two bodies reach the seesaw at the same time? It’s because two bodies of different masses, dropped from the same height, will touch the floor at the same time in the absence of other forces (as the air resistance), thankyou Galileo! ;-)

Blender Rigid Body Mass