AP Physics AP Physics Fluid Mechanics & Energy Systems

Question 1

Pressure in a static fluid at depth h is given by:

Accepted Answer

P = ρgh

Answer

Hydrostatic pressure at depth h in a fluid of density ρ is P = ρgh.

Question 2

Archimedes' principle states that the buoyant force on an object equals:

Accepted Answer

The weight of displaced fluid

Answer

Archimedes' principle states that the buoyant force equals the weight of the fluid displaced by the object.

Question 3

According to the continuity equation for an incompressible fluid, if pipe area decreases, fluid speed:

Accepted Answer

Increases

Answer

The continuity equation A₁v₁ = A₂v₂ requires speed to increase when cross-sectional area decreases.

Question 4

Bernoulli's equation relates pressure, fluid speed, and height for:

Accepted Answer

Incompressible, non-viscous steady flow

Answer

Bernoulli's equation applies to incompressible, non-viscous fluids in steady (laminar) flow.

Question 5

In Bernoulli's equation, where fluid speed is greatest, the pressure is:

Accepted Answer

Lowest

Answer

Bernoulli's equation shows that increased fluid speed corresponds to decreased pressure.

AP Practice Test