Explain about the characteristics of work.

Explanation

Characteristics of work:
(i) Work is defined as the force (F) multiplied by the displacement (x ).
-w=F.x …(1)
The -ve sign is introduced to indicate that the work has been done by the system by spending a part of its internal energy.
(ii)Work is a path function.
(iii) Work appears only at the boundary of the system .
(iv) Work appears during the change in the state of the system .
(v)Work brings a permanent effect in the surroundings .
(vi)Units of work:The SI unit of work is the joule (J) or Kilojoule (KJ).
(vii)if work done by the system , the energy of the system decreases , hence by convention work is taken to be negative (-w).
(viii) If work done by the system , the energy of the system increases , hence by convention work is taken to be positive (+w).