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Homework Help: Physics problem - Real fluids

  1. Apr 30, 2010 #1
    1. The problem statement, all variables and given/known data
    A small block is attached on the left of a larger block by a thin layer of grease, 2 micrometres (10^-6) thick. The mass of the smaller block is 0.15 kg and the area of contact is 8x10^-4 metres squared. If the smaller block slides down 5 mm in 2 weeks, calculate the viscosity of the grease. ANSWER: 9.07x10^5 Pa.s

    2. Relevant equations
    A formula which may help is Force/Area = Viscosity(change in velocity)/distances between areas of contact F/A = (n x delta v)/delta x

    3. The attempt at a solution
  2. jcsd
  3. May 1, 2010 #2


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    Staff Emeritus
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    Homework Helper

    Welcome to Physics Forums.

    That looks like the right equation. Try plugging in the information you are given.
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