Control questions. 1. What is the physical origin of viscous friction in liquids and gases?
1. What is the physical origin of viscous friction in liquids and gases? 2. Write down Stocks’ formula for resistance force experienced by a ball moving in a viscous medium. 3. What is condition of validity for Stocks’ method? 4. Obtain (8.6) starting from the equation of ball’s motion. 5. Substituting into (6) reasonable values for radius and speed, estimate the coefficient of viscous friction of water (
Authors: V.P. Kurbatsky, the reader, candidate of physical and mathematical sciences. Reviewer: S.P. Lushchin, the reader, candidate of physical and mathematical sciences. Approved by the chair of physics. Protocol № 3 from 01.12.2008.
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= 1000 kg/m3).
