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.
(By definition, one newton is that amount of force that accelerates a kilogram of mass 1 m/sec 2. ). The acceleration of gravity is 9.8 m/sec 2. The weight of a body is the force exerted by the earth on the body and this force accelerates the body at a rate of 9.8 m/sec 2. Thus the gravitational force on a 1 Kg object must be a force of 9.8 newtons.