Work Done by the Tensile Force in an Inextensible Cable

Displacement at one end of an inextensible cable (cord, string) is always equal to the displacement at the other end. Forces acting on the two endpoints, however, are equal in magnitude but opposite in direction. Thus, if two bodies are connected by a cable, the work done by the cable on the system of two bodies is equal to zero. Although ligaments and tendons t










spring shown in Fig. 8.5 on the mass m is t t t of the human body are cable-like structures, they nonetheless undergo small stretches in response to applied force. Therefore, they behave more like an elastic spring in tension than an inextensible cable.

Getting Started With Dumbbells

Getting Started With Dumbbells

The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.

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