Unit 8: Fluids
Physics 1 · Unit 8 · Paper 2

Fluids unit test

A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.

Paper 1Paper 2Paper 3
Each paper is built from this unit’s 38 terms and is the same for everyone, so a teacher can assign “Unit 8, Paper 2” and every student sits the identical test. Multiple choice is marked objectively; the written sections you mark yourself against the model answer and rubric.
Suggested time 34 min 31 points0/17 attempted
1

Why a denser fluid means less submerged

2

Continuity equation

3

Bernoulli's terms are energies per unit volume

4

Pressure with depth

5

The floating fraction is a pure density ratio

6

Applying Bernoulli and continuity together

7

Volume flow rate

8

Condition for floating

9

Buoyant force

10

Density

11

Assumptions in Bernoulli's equation

12

Fraction submerged

Short answer 1. Define or explain: Why a shower curtain pulls inward

3 pts

Short answer 2. Define or explain: Gauge vs absolute pressure

3 pts

Short answer 3. Define or explain: Hydraulic advantage

3 pts

Short answer 4. Define or explain: Floating condition

3 pts

Free response

7 pts

A solid cube of side 0.10 m and mass 0.72 kg is placed in a container of water (density 1000 kg/m³). (a) Determine whether the cube floats or sinks, showing your reasoning. (b) If it floats, calculate the depth to which it is submerged; if it sinks, calculate its apparent weight when fully submerged. (c) The water is replaced with a fluid of density 700 kg/m³. Describe qualitatively what happens to the cube and justify your answer using the same principle.

Determine whether the cube floats or sinks, showing your reasoning.

If it floats, calculate the depth to which it is submerged; if it sinks, calculate its apparent weight when fully submerged.

The water is replaced with a fluid of density 700 kg/m³. Describe qualitatively what happens to the cube and justify your answer using the same principle.