Lecture 28: Hydrostatics - Archimedes' Principle - Fluid Dynamics - What Makes Your Boat Float? - Bernoulli's Equation
recorded by: Massachusetts Institute of Technology, MIT
published: Oct. 10, 2008, recorded: November 1999, views: 47007
released under terms of: Creative Commons Attribution Non-Commercial Share Alike (CC-BY-NC-SA)
Download mit801f99_lewin_lec28_01.m4v (Video - generic video source 105.1 MB)
Download mit801f99_lewin_lec28_01.rm (Video - generic video source 105.8 MB)
Download mit801f99_lewin_lec28_01.flv (Video 106.6 MB)
Download mit801f99_lewin_lec28_01_352x240_h264.mp4 (Video 146.3 MB)
Download mit801f99_lewin_lec28_01.wmv (Video 430.8 MB)
Report a problem or upload filesIf you have found a problem with this lecture or would like to send us extra material, articles, exercises, etc., please use our ticket system to describe your request and upload the data.
Enter your e-mail into the 'Cc' field, and we will keep you updated with your request's status.
1. Archimedes' Principle:
The buoyant force on an immersed body is shown to equal the weight of the displaced fluid (Archimedes' Principle). Such weight measurements can be used to determine the average density of irregular objects, and also to estimate body fat in people.
2. Floating Objects:
Most of an iceberg is submerged because its density is only a little less than the density of water. Boats float, rocks sink. Professor Lewin poses another brain teaser.
3. Stability of Floating Objects:
The center of mass of a floating object should be below the center of mass of the displaced fluid for stability; this is an important ship design concept.
The buoyant force of air on a balloon is discussed. It is demonstrated how a balloon and a pendulum behave in accelerated, closed containers.
5. Fluid Dynamics, Bernoulli's Equation:
Bernoulli's equation is presented as the conservation of energy for an incompressible fluid flow. For flow through a pipe of varying cross section, Bernoulli's equation shows that the pressure is the lowest at the smallest cross section where the velocity of the fluid is the highest. Bernoulli's equation is also applied to syphons.
6. Fluid Mechanic Magic:
Some non-intuitive demos show how ping pong balls behave in air streams.
Link this pageWould you like to put a link to this lecture on your homepage?
Go ahead! Copy the HTML snippet !