Calculate the dynamic viscosity of an oil, which is used for lubrication between square plate of size 700 mm x 700 mm and inclined plane with an angle of inclination 45° as shown in Fig. below. The weight of the square plate is 250 N and it slides down the inclined plane with a uniform velocity of 0.35 m/s. The thickness of oil film is 1.4 mm. Liquid film of thickness h 250 sin 25 u = 0.35 m 250 cos 25

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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.