18.7.4. Surface Forces Overview

Try these first

1. 1.

   Define pressure force.

   Hint

   Think about how fluid pushes against surfaces.

2. 2.

   What do viscous forces depend on?

   Hint

   Consider how different fluids flow.

3. 3.

   What type of force acts perpendicular to a fluid's surface?

   • Viscous Force
   • Pressure Force
   • Gravity Force

   Hint

   Think about how fluids push against surfaces they encounter.

4. 4.

   True or False: Viscous forces help in increasing the flow velocity of fluids.

   • True
   • False

   Hint

   Remember how thicker fluids behave compared to thinner ones.

5. 5.

   A pipe has water flowing at three distinct sections, creating various pressure and viscous forces. Calculate how changes in these forces affect the velocity at each section.

   Hint

   Use Bernoulli's equation as a starting point.

6. 6.

   In a river, how would the introduction of a dam affect both pressure forces upstream and viscous forces downstream? Analyze the implications on flow behavior.

   Hint

   Think about how hydraulic pressure changes with elevation and flow restrictions.