Question 1. The apparatus shown in the figure is used to coat a thin steel plate with oil. Fluid1 is oil with a viscosity of 0.02 Pa.s, Fluid2 is 0.001 Pa.s. If h = 4 mm and the total oil-steel contact area is 20 m², calculate the force required to move the steel at 5 m/s. Suppose the velocity profile in the fluid is linear.

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.