A thin plate travels between two plane, parallel, horizontal and stationary surfaces at a constant speed of 7 m/s. The two stationary surfaces are spaced 6 cm apart, and the middle is filled with oil of viscosity of 0.9 Ns/m2.The moving plate submerged in oil has a length of 2 m and a width of 0.5 m. (i) If the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. (ii) Determine the force if the plate was 1 cm from the bottom surface and 2 cm from the top surface?

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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.