Here are two neat videos regarding friction!
In the first, the Mythbusters try to pull apart two phone books that are being held together by nothing but friction caused by the pages laying on top of each other. How hard will this be to fix? Will you need two people? Ten people? .... Tanks!?
Next we have a video demonstrating the by-product of friction: heat. How much heat could you generate from friction? Enough to weld steel together?
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