IB Physics Viscosity

A tutorial sheet on viscosity is given below.

  1. Is viscosity a force?
  2. What is the cause of viscosity?
  3. State the SI unit for viscosity.
  4. A small sphere of radius r is falling vertically in a fluid of viscosity 𝛈 and density 𝜌. Find an expression for the terminal speed of the sphere.
  5. A viscous fluid flows steadily through a horizontal pipe. Does the pressure exerted by the fluid change along the pipe?