[FOM] proofs by contradiction in (classical?) Physics

Ivan Antonowitz binchem at mweb.co.za
Tue Sep 20 12:56:02 EDT 2011

 Antonino Drago posted:
Many results - also in mechanics - have been obtained (since the time of 
Stevin) by arguments relying on the impossibility of the perpetual motion, a 
principle from which no direct proof can be obtained.

Galileo caused an intuitive crisis when he deduced that a cannon ball would 
continue to move forever if left alone. Any way of extracting energy would 
cause it to stop and halt its perpetual motion!

Ivan Antonowitz. 

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