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.
Mass is the measure of inertia that an object has. Contrary to popular belief, mass and weight are two different terms. Weight refers to the net gravitational force exerted onâ¦ an object, with an SI unit of Newtons, while mass refers to the ability of the object to resist changes in velocity, or acceleration.