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There is a long history in science museums of "pedal this to power  
that to get some meaningful visceral measurement of energy required  
to do X".  I just thought of a fun one to add to the mix:

Take the hood and the engine out of a car and put a bicycle there  
that they have to peddle to move the car.   it's a natural group  
activity- the pedaler is just an engine- someone else drives, and I'm  
sure the engine will get humorously heckled.  Ideally there would be  
a light car and a heavy one.   I'm sure you can get a hummer cheap  
these days.

I remember a Gahan Wilson cartoon of this.   The gas station  
attendant opens the hood and the guy chained in there says "For god's  
sake, call the cops!"

Clifford Wagner

www.scienceinteractives.com
Traveling Exhibits Visitors Love

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