Arm and leg weakness can be caused by a variety of different conditions, some of them temporary and others chronic. Excessive exercise is one cause of temporary fatigue in the major muscle groups, although this is not considered true muscle weakness.
Mass is an intrinsic property of the body and gravity is the force exerted on any body by the things that surround it. Weight, on the other hâ¦and, depends on gravity. It is equal to the product of the mass of the body and the gravitational force acting on it.
Weight is the effect that gravity has on an object. Mass is the amount of matter in an object irrespective of the effect that gravity has on it. If you were to move a flagpole over to the Moon, its weight would be reduced roughly by 5/6, but its mass would stay the same.