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  4. A flat plate of area 0.1 m 2 is placed on a flat surface and is separated from it by a film of oil 10-5 m thick whose coefficient of viscosity is 1.5 N sm -2. The force required to cause the plate to slide on the surface at constant speed of 1 mm s -1 is

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Q. A flat plate of area $0.1\, m ^{2}$ is placed on a flat surface and is separated from it by a film of oil $10^{-5} m$ thick whose coefficient of viscosity is $1.5\, N\, sm ^{-2}$. The force required to cause the plate to slide on the surface at constant speed of $1\, mm\, s ^{-1}$ is

Mechanical Properties of Fluids

Solution:

$F=\eta A \frac{V}{l}$
Substituting values,
$=1.5 \times 0.1 \times \frac{1 \times 10^{-3}}{10^{-5}}$
$=15 \,N$