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Erg: In the CGS system of units, it is the absolute unit of work. When a force of one dyne really moves a body one centimetre in the direction of applied force, that movement is referred to as one erg of work.
The gravitational unit of labour in the CGS system of units is the gram-centimeter (g-cm). One g-cm of work is completed when one gf of force is applied.
transports a body one centimetre in the direction of the applied force.
For instance, when we press firmly on a wall, there is no displacement, hence the force applied to the wall is ineffective. But while this is going on, our internal energy is being depleted as our muscles alternately contract and relax. That's the reason we do become fatigued.
