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 amount of matter contained in a body. Mass of the body is the constant quantity and does not change with the change of position or location. Weight 1  : Weight is the force by which the earth attracts a body toward its centre, Or we can say it is the force on the object which is offered by the gravity.