Posted by: Michael | 06/02/2008

Reading: really watching and listening

Negative or Postive?

I’ve been listening to Physics Lectures from MIT by Professor Lewin, great stuff. I’m also listening to Berkeley courses Chem and Operating Systems; more on them in another post.

Prof. Lewin does a demonstration in lecture six where he rubs cat fur on glass puts and then plaeces a metal paddle on the glass,  touches with his finger the paddle, and finally touches the paddle to a metal can. He tells us the glass is positive and metal can is negative.

I listened to this yesterday and it took me until ten minutes ago to understand why the metal can was negative. grrrrrrrr I feel stupid!


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