Physics Physics Fluid Dynamics 2

Question 1

Bernoulli's principle relates which quantities in steady fluid flow?

Accepted Answer

Pressure, velocity, and height

Answer

Bernoulli's principle states that the sum of pressure, kinetic energy per unit volume, and potential energy per unit volume is constant along a streamline.

Question 2

According to Bernoulli's equation, what happens to pressure when fluid velocity increases?

Accepted Answer

Pressure decreases

Answer

Bernoulli's equation shows an inverse relationship between fluid velocity and pressure — as velocity increases, pressure decreases.

Question 3

What is the Reynolds number used to determine in fluid mechanics?

Accepted Answer

Whether flow is laminar or turbulent

Answer

The Reynolds number is a dimensionless quantity used to predict whether fluid flow will be laminar or turbulent.

Question 4

What does the continuity equation A₁v₁ = A₂v₂ predict when a pipe narrows?

Accepted Answer

Fluid speeds up

Answer

When a pipe narrows (A decreases), the fluid velocity must increase to maintain constant mass flow rate, as required by the continuity equation.

Question 5

What is terminal velocity?

Accepted Answer

Constant speed when drag equals gravitational force

Answer

Terminal velocity is the constant speed a falling object reaches when the drag force exactly equals the gravitational force, resulting in zero net acceleration.

Physics Practice Test

Physics Practice Test

Physics Physics Fluid Dynamics 2