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.
Because the density is directly related to the mass, the specific gravity can also be determined from the ratios of the mass of the object to the mass of water, or the weight of the object to the weight of water. The specific gravity has no units and its value determines if the object will float or sink in water.