Phys 115 1st Edition Lecture 5Outline of Last Lecture I. ViscosityII. Poiseuille’s EquationOutline of Current Lecture III. Reynolds NumberCurrent Lecture- Reynolds number is the ratio of inertial to drag forceso Viscosity increases, drag increaseso Size of object increases, drag increaseso Speed increases, drag increases- Drag force of a fluid of viscosity η on a sphere of diameter d moving at slow speed v:o- Inertial force is the force needed to accelerateo What you exerto The harder to change motion, the more inertiao Which is harder to change motion? Fast or slow? Fasto Increase velocity, increase inertiao Increase density, increase inertia- Reynolds numberoo Where n =hro When Re is small, VISCOUS forces dominateo When RE is large, INERTIAL forces dominate- CR6o 80,000*105 (no units)- CR10o Viscous forces dominateo Halt occurs immediatelyThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.o Re = 10-5- CR12o Whale is much larger and moving much fastero Re = 3*108- Scalingo Speed increaseso Velocity = 4000
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