Force from a Change in Flow Velocity
Mediummomentumfluid forces
Steady water flow of 0.10 m3/s changes average velocity from 2 to 5 m/s in the same direction. What is the magnitude of the net external force on the water in that direction? Use ρ = 1,000 kg/m3 and uniform velocity profiles.
- A30 N
- B100 N
- C300 N
- D700 N
Show solutionHide solution
Answer: C. 300 N
The linear momentum equation gives Fnet = ρQ(Vout − Vin) = (1,000)(0.10)(5 − 2) = 300 N. This is the net force on the fluid, including all external force contributions.
Practice this deckUntimed, one problem at a time, with your progress saved.
Related problems
- Density from Mass and Volume · Fluids & Hydraulics
- Gauge Pressure at Depth in Water · Fluids & Hydraulics
- Pipe Velocity When Diameter Is Halved · Fluids & Hydraulics