A flat plate of area 2 m square is separated from a large plate by a layer of oil 2 mm thick. If the coefficient of viscosity of this oil is 0.0l Pa s, what force is required to keep the plate moving with velocity of 5 cm/s. Also find the strain rate.
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F = η A dv/dx
= 0.01 Pa s × 2 m² × (0.05 m/s)/(0.002 m)
= 0.5 N
∴ Force required is 0.5 N
= 0.01 Pa s × 2 m² × (0.05 m/s)/(0.002 m)
= 0.5 N
∴ Force required is 0.5 N
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