Racetrack is a game with very simple rules which nonetheless does a surprisingly good job of simulating the acceleration, braking, and handling of a race car. It can teach not only about inertia and kinematics, but also about optimal racing lines. Racetrack can be played with nothing more than a piece of graph paper and a pen, but there is also an online implementation called Vector Racer.
The sliding rocks of Racetrack Playa in Death Valley, California have mystified and delighted visitors for decades (previously). Now planetary scientist Ralph Lorenz and colleagues think they've figured out how the rocks get around: ice rafts float the rocks out of the mud, reducing friction enough that modest winds can push them along (PDF of Lorenz et al., American Journal of Physics, Vol. 79, 1 January 2011). [more inside]
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Death Valley car trip photos including some panoramas of the racetrack and its mysterious stones, and cute kids. via
Chinese Pop Posters. More :- Guangzhou's racing track, patrolling despair, Cuba, under New York, Bombay bazaar, and Chinese rural architecture. All from the excellent Atlas magazine - more here.
Spend a day at the race tracks. It's Friday, so click away. Play to win. Play to lose. It's all about the virtual Benjamins.