These consist of Kahn's blackboard solutions of algorithmic exercises to find:
(1) the acceleration "a" of a Porsche, given the change in its velocity v during a change in time t; and
(2) the acceleration "a" of a block, given its mass m and the force F acting on the block.
There's little attempt to lead students to a *conceptual* understanding of either acceleration or Newton's Second Law. There's no emphasis on *operational* definitions of velocity, time, acceleration, force, or mass. Kahn appears to be (a) oblivious of physics education research, and (b) simply repeating in a traditional way the cookbook stuff he learned at MIT in passive-student lectures.
I note that there's a 68-post thread "Khan Academy: Math instruction goes viral" on the MathEdCC at <http://bit.ly/FOoNt6> which contains, among other things, negative comments on Kahn's math video on averages at <http://bit.ly/AaMkpu>.
a. Guy Brandenberg (2011) wrote: "That is one of the worst lessons on stats and averages I have ever seen. . . . He acts like the important part is the computation itself. He gives no reason WHY we should add the numbers up then divide. . . . . . And people pay him money? And think he's doing a great job?. . . . He's about as bad as John Saxon."
b. Domenico Rosa (2012) wrote: "I have not seen many of Khan's videos, and his style of teaching is significantly inferior to the teachers that I had in the public school system in the factory city of Everett, MA. My point is this: All the hits that his videos are getting are indicative of the hunger for direct instruction--a fact that has been completely missed by the media pundits who have been giving him so much exposure."
REFERENCES [URL's shortened by <http://bit.ly/> and accessed on 15 March 2012.] Brandenberg, G. 2012. "Re: Khan Academy: Math instruction goes viral," on the OPEN! MathEdCC archives at <http://bit.ly/FOpC53>. Post of 7 Sep 11:01 PM to MathEdCC.
Hake, R.R. 2012. "Re: Khan Academy on Sixty Minutes" on the OPEN! AERA-L archives at <http://bit.ly/zsYxUk>. Post of 15 Mar 2012 10:59:14-0700 to AERA-L and Net-Gold. The abstract and link to the complete post are being transmitted to several discussion lists and are also on my blog "Hake'sEdStuff" at <http://bit.ly/yapt2S> with a provision for comments.
Rosa, D. 2011. "Re: Khan Academy: Math instruction goes viral," on the OPEN! MathEdCC archives at <http://bit.ly/z2qEml>. Post of 12 Sep 1:59 PM to MathEdCC.