8.1.5. Force Components due to Pressure

Try these first

1. 1.

   What type of pressure is measured above atmospheric pressure?

   Hint

   Think about how pressure is measured in everyday devices like tire gauges.

2. 2.

   What happens to shear stress when fluid is at rest?

   Hint

   Consider the forces acting on the fluid surfaces.

3. 3.

   What is the primary force acting on a fluid at rest within a control volume?

   • Shear Stress
   • Normal Stress
   • Frictional Force

   Hint

   Consider what forces are present when the fluid isn’t moving.

4. 4.

   True or False: Gauge pressure can be negative.

   • True
   • False

   Hint

   Think about measuring pressure in a vacuum.

5. 5.

   Calculate the absolute pressure at a depth of 10 meters of water. Given that the density of water is 1000 kg/m³ and atmospheric pressure is 101.3 kPa.

   Hint

   Remember to add atmospheric pressure to the hydrostatic pressure.

6. 6.

   If the gauge pressure in a tire is 35 psi, what is the absolute pressure assuming atmospheric pressure is 14.7 psi?

   Hint

   Always add atmospheric pressure to get absolute pressure.