Cal Tech on pull vs push
 

note mention of the high school student who understood the problem. note also
that no motion could be made.

[sher, keep telling us you know better because you are a bettere physicist]

http://216.239.39.104/search?q=cache...pdf/physics/03
12087+feynman+%22lawn+sprinkler%22&hl=en&ie=UTF-8