Buoyancy and Newton's 3rd Law - Testing Physics

Claim: Archimedes Principle - the strength of the buoyant force is equal to the weight of the fluid displaced. We do a series of experiments that put that claim to the test under a variety of circumstances. We also demonstrate an interesting case of Newton's 3rd law.
Note that this experiment is one that can be done at home with minimal equipment (spring scale for a force sensor and a graduated cylinder are main pieces of equipment and you can get those at fairly low cost, and they're useful for other experiments as well).
Full Series Playlist: • Testing Physics
0:00 Introduction - Archimedes Principle
2:11 How can we test this?
3:13 Measuring the buoyant force
5:43 Measuring the weight of fluid displaced
7:34 Details of experimental setup
11:42 Buoyant force on Al cylinder in water
22:34 Does depth in fluid matter?
24:41 Newton’s 3rd Law Consequences
27:02 Buoyant force on cylinder in rubbing alcohol
34:23 Buoyant force on iron sphere
38:21 Concluding remarks
Opening Image Credit: NASA, ESA, CSA, Janice Lee (NSF's NOIRLab) webbtelescope.org/contents/me...

[@_John_Sean_Walker]

👍 Great experiment.

[@Ian.Gostling]

Great to see experiments being done, it's quite rare!

[@phredro1731]

very well explained and demonstrated.