18.7.2. Forces Acting on Control Volume

Try these first

1. 1.

   What is the primary body force acting on fluids?

   Hint

   Think about what pulls objects towards the Earth.

2. 2.

   Define pressure force.

   Hint

   Remember the effect of pressure on a surface.

3. 3.

   What type of force is gravity classified as?

   • Surface Force
   • Body Force
   • Viscous Force

   Hint

   Think of which force acts on the entire volume.

4. 4.

   True or False: Surface forces include pressure and viscous forces.

   • True
   • False

   Hint

   Remember the forces that apply at the surfaces.

5. 5.

   Calculate the net force acting on a control volume with a particular density of 850 kg/m³ in a uniform gravitational field and having a volume of 3 m³.

   Hint

   Use the formula for body force affecting the control volume.

6. 6.

   Discuss how the changing cross-sectional area of a pipe influences both surface and body forces on the fluid.

   Hint

   Consider conservation principles in fluid dynamics.