# Chapter Six – Fluid Dynamics

Gases and liquids are considered to be fluid in nature. This chapter is all about the study of fluids. To study the motion of fluids two equations are used named as equations of continuity and Bernoulli’s equation.

In fluids a retarding force exist known as drag force, which opposes the motion of object in fluids. Drag force also increases with increase in speed of object. Terminal velocity is the maximum velocity of an object falling vertically downward.

Ideal fluid is in-compressible and non-viscous. Smooth flow of fluid is laminar flow and disordered flow of fluid is turbulent flow.Law of conservation of mass is used in equation of continuity and law of conservation of energy is used in bernoulli’s equation.In a pipe,as speed of fluid increases,pressure decreases this relation is known as venturi relation.