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PHYS-L@lists.nau.edu writes:I recently bought a pair of 2" steel ball bearings that are smacked together
To demo this kind of transformation I drop a steel ball onto a one of
the temperature sensitive color changing post cards (the Exploratorium
sell these). The card must be on a hard floor. A color change occurs at
I have done this with a LARGE (2kg) iron ball onto a section of 1x4 and
then placed the LC card on the spot where it hit and noticed a very nice
temperature rise.