Thursday 6/18 PHYS 2010 Nathalie Hoffmann University of Utah

Gauge Pressure

Archimedes’ Principle The buoyant force on an object immersed in a fluid is equal to the weight of the fluid that the object displaces.

Volume Flow Rate (Q)

Steady vs. Unsteady Flow Steady flow: the flow pattern at any given point does not change with time, at any given point the flow velocity remains constant with time; does not mean the flow velocity is constant everywhere Unsteady flow: the flow velocity at a given point can change with time

Laminar vs. Turbulent Flow Laminar flow: each bit of fluid follows a path called a streamline, which do not cross Turbulent flow: no streamlines, adjacent bits of fluid can follow very different paths

Viscosity Viscosity is an intrinsic resistance to flow. Because adjacent parts of a fluid move at different velocities, the parts rub and exert frictional forces on each other.

Bernoulli’s Principle