AP®︎ Physics 1: Topic 8.4 Practice Test

Prepare for your quiz, test, or the AP exam with focused practice questions on Topic 8.4 of AP Physics 1 – Fluids and Conservation Laws.

Questions List

Topic 8.4

Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12

Question 1 Easy

Figure
Water flows steadily through the horizontal pipe shown.

Which statement correctly compares the water’s speed at points 1 and 2?
AThe speeds cannot be compared without knowing the pressures.
BThe speed is greater at point 2.
CThe speed is the same at both points.
DThe speed is greater at point 1.

What You’re Being Tested On:

Explore the learning objectives taken directly from the College Board’s AP® Physics 1 Curriculum. Ensure you’re prepared for the exact topics covered on the AP® exam, in-class tests, and quizzes, and gain confidence in your mastery of the material.

Topic 8.4: Fluids and Conservation Laws

Boundary Statements official exam scope notes

  • All fluids will be assumed to be ideal, and all pipes are assumed to be completely filled by the fluid, unless otherwise stated.

Learning Objective: 8.4.A

Describe the flow of an incompressible fluid through a cross-sectional area by using mass conservation.

Essential Knowledge: 8.4.A.1

A difference in pressure between two locations causes a fluid to flow.

Essential Knowledge: 8.4.A.1.i

The rate at which matter enters a fluid-filled tube open at both ends must equal the rate at which matter exits the tube.

Essential Knowledge: 8.4.A.1.ii

The rate at which matter flows into a location is proportional to the cross-sectional area of the flow and the speed at which the fluid flows. Derived equation: Vt=Av\frac{V}{t} = Av

Essential Knowledge: 8.4.A.2

The continuity equation for fluid flow describes conservation of mass flow rate in incompressible fluids. Relevant equation: A1v1=A2v2A_1v_1 = A_2v_2

Learning Objective: 8.4.B

Describe the flow of a fluid as a result of a difference in energy between two locations within the fluid–Earth system.

Essential Knowledge: 8.4.B.1

A difference in gravitational potential energies between two locations in a fluid will result in a difference in kinetic energy and pressure between those two locations that is described by conservation laws.

Essential Knowledge: 8.4.B.2

Bernoulli’s equation describes the conservation of mechanical energy in fluid flow. Relevant equation: P1+ρgy1+12ρv12=P2+ρgy2+12ρv22P_1 + \rho gy_1 + \frac{1}{2}\rho v_1^2 = P_2 + \rho gy_2 + \frac{1}{2}\rho v_2^2

Essential Knowledge: 8.4.B.3

Torricelli’s theorem relates the speed of a fluid exiting an opening to the difference in height between the opening and the top surface of the fluid and can be derived from conservation of energy principles. Derived equation: v=2gΔyv = \sqrt{2g\Delta y}

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