Archimedes Principle
1. Author: Ralph von Philp (
2. This lab is a traditional buoyancy experiment where Archimedes’ Principle is verified. Buoyant force is determined by weight of fluid displaced, and from the difference between the mass of an object in air vs. mass in water. For my objects, I use blocks and cylinders from the PASCO Density Set.

Fluid Notes: Here are my fluid notes. Admittedly, this is often my students weakest area so I stick close to the notes and try to beat in the real big issues. . Contributed: Mark W. Hossler\

Archimedes Principle: - Old AP problem with words changed to create an open ended lab. Submitted by: Mark W. Hossler,

Fluids & Oscillators Notes: Donated from Wayne Mullins. Click here to check them out.
Wayne's (now somewhat old) notes can be accessed at

Fluids by Greg Jacobs at College Board website:
Bernoulli's Principle Open-ended Lab: - Similar to an old AP problem, changed into an open-ended lab. Submitted by: Brittany Reed,

Buoyancy Virtual Lab: Due to time restrictions, I have my students do Fluids as an independent study and created this 2 part virtual lab as part of the unit. Part A involves dropping different density objects into various fluids and predicting what happens, ranking their densities and then calculating the density of a solid and a fluid as a result. Part B has the students lower materials into a fluid and predict what happens to the tension in the string, buoyant force and weight. They also then calculate density from the change in string tension.

The simulations only give the students the depth under fluid level and the tension in the string for Part B. I also included 2 other simulations with full FBDs and values for all forces that can be used for demonstration purposes or when going over what happens in the lab.

Lab Files:

Student Part A: Buoyancy Virtual Lab 1
Student Part B: Buoyancy Virtual Lab 2
Instructor Part A: Buoyancy Demo Lab 1
Instructor Part B: Buoyancy Demo Lab 2

Submitted by : Mike Maloney []

Modified Bernoulli Challenge Lab (based on Brittany's above): Students have to predict where a water stream will hit the ground when a hole is punched in a bottle of water turned into an open ended competition lab challenge. Students can be given extra credit if they choose to put the catch cup on top of them when laying on the ground (showing faith in their physics). The solution is very "pretty".

Submitted by: Mike Maloney []

Drag Force Lab Using Coffee Filters, Motion Detector and PASCO 750 Interface
for AP Physics C students - Mike Gilmore
This is based on Brendan Crowley's Coffee Filter lab
I am looking for some feedback on this lab. Could someone with a background in fluid dynamics comment on the crux of the lab (i.e. the power fit, and the question about Stokes vs Newtonian drag) Thanks, Mike

Fluids "Real World" Review Challenge
7 events I had my students do to review for their Fluids Test. I was trying to have students model FR problems.
Submitted by: Kristin Glover

Viscous Fluid Friction Lab:
Dropping ball bearings thru liquid laundry detergent arrives at Drag = kv^1 with associated calculus development from the lab results.
-Jeff DeCurtins (

PhET Buoyancy Sim Questions and Homework I used these in a study session for AP B, should work for anyone teaching fluids. Should give you ideas for your own activities with this great PhET sim - Dan Burns