Crazy swim race

My sons and friends.

http://www.youtube.com/watch?v=i2gCIgcq3Ac

Good-bye to the Cottage

The water is down, and I can barely get the boat out of the slip.  It has become freezy-wheezy, with snow and frost coming.  The colours are at their max, but it is time to leave.  I'm always astounded at how much firewood we use when it is this cold.  The water is at 60 deg F, and nobody wanted to jump in.

This year we went on a rock obsession, and the kids are rolling big ones into the lake.  In the spring, the water comes up to those trees.  I tried to help for 2 seconds, slipped and nearly killed myself.  Yeah for the youngsters!

I drain out all the water, and fill everything with plumber antifreeze.  One drop of frozen water can burst a pipe.  Yes, this year, we are in for a winter!

Dry fault mechanics

Article

Another dry rock friction test.  They should put a hose on it!  Note that when they engage the clutch, there is a big friction jump, but then it settles down to a steady dry friction of 0.5, which is quite high.  Big earthquakes see the friction go down to zero.  That initial spike is probably just a result of the clutch collision.

Adding water should activate proper dynamic friction.  Does the water film actually heat, or does it just interfere with re-adhesion.  Would be interesting....