Chapter 06: Fluid Dynamics

This is a sixth chapter of the book Physics 11 published by Punjab Curriculum and Textbook Board, Lahore, Pakistan.

After studying this chapter the students will be able to:

• Understand that viscous faces in a fluid cause a retarding force on an object moving through it.
• Use stokes' law to derive an expression for terminal velocity of a spherical body falling through a viscous fluid under laminar conditions.
• Understand the terms steady (laminar, streamline) flow, incompressible flow, non-viscous flow as applied to the motion of an ideal fluid.
• Appreciate that at a sufficiently high velocity, the flow of viscous fluid undergoes a transition from laminar to turbulence conditions.
• Appreciate the equation of continuity $Av=$ Constant for the flow of an ideal and incompressible fluid.
• Appreciate that the equation of continuity is a form of the principle of conservation of mass.
• Understand that the pressure difference can arise from different rates of flow of a fluid (Bernoulli effect).
• Derive Bernoulli's equation in form $P+\frac{1}{2} \rho v^2+\rho gh=$ constant.
• Explain how Bernulli effect is applied in the filter pump, atomizers, in the flow of air over an aerofoil, Venturi-meter and in blood physics.
• Give qualitative explanations for the swing of a spinning ball.