It is given as the velocity of the moving surface divided by l (the original length of the material). Strain rate is the rate of change of deformation or strain in a material. It is defined as the force tangent to the material surface divided by the area in which it acts. Shear stress is the the friction between fluid particles sliding past each other. Viscosity is denoted by η (eta) as the ratio of the shear stress (Force/Area) to the strain rate. Viscous forces oppose the motion of one portion of the fluid relative to another. Viscosity is internal friction inside a fluid. Is it close to the value you found experimentally? Alternatively use the viscosity of glycerin to calculate the terminal velocity.Also, compare it to the given values in the table below. Using the times recorded in glycerin find the terminal velocity and use that in stokes equation to find the viscosity of glycerin.Ask students why Stoke s Law will not work for water in this case.switch off the stopwatch when the ball passes the second ring.Start the stopwatch when the ball passes the first ring (this time will be used to calculate the terminal velocity of the ball).Both tubes have two dark rings a meter apart. Two long tubes are filled with fluids of different viscosities, one with water and the other with glycerin. Finding viscosity of a liquid by measuring velocity of small balls sinking in the tall tubes, and applying Stoke’s equation.
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