
1
Formation
of a Di erential
Equation
1.1 INTRODUCTION
The general laws of science, engineering, medicine, social sciences,
population dynamics and the like where the rate of change of quantities
is involved are usually modelled as differential equations. Formation of
differential equations, solution and interpretation of the results are of
practical interest, especially for engineers and physicists, as they deal
with many engineering and physical problems. So, we study in this
chapter, methods of solution of ordinary differential equations of the
fi rst order and fi rst degree, their applications to Newton’s law of cool-
ing the law of natural ...