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December 15, 2014 Archives

In which we encounter - cow-tipping!

This is apparently the focus of both myth & mirth in the US: the idea that cows, asleep on their feet, are regularly tipped over by tipsy youths. Now, apart from the inconvenient little fact that cows tend to sleep lying down & thus are supremely untippable at that point in their daily rhythm, our bovine friends are large and solid and (with a leg at each corner) well-balanced. Nor do I imagine that Daisy would take kindly to a shoulder charge from an inebriated young man.

And indeed, at ModernFarmer, Jake Swearingen dissects this myth & imparts a little physics with along with the humour & the facts. It turns out that back in 2005 a couple of researchers ran the numbers & decided it would be impossible for a single person to overturn poor Daisy, but that two or more tippers could - theoretically - knock her off her feet. Provided that she did not see them coming, or negate their efforts by shifting her weight, that is.

And I loved one of the comments on the Atlantic's coverage of this story:

Lillie and Boechler are clearly unfamiliar with the conventions of this sort of work. As every mathematician or physicist ought to know, thought-experiment cows are universally spherical. And spherical cows are easily tipped, it's just that nobody can tell the difference. Now, if you've got enough drunken frat boys for a full-on game of Sleeping Cow Billiards...

Spoilsports may object that real cows aren't spherical. Neither are they rigid bodies, as is implicitly required by the Lillie-Boechler analysis. Each leg is hinged in two places, and depending on the resistance and range of motion of the joints, cow tipping could on purely physical grounds range from trivially easy to nigh impossible. If someone wants to instrument a live, sleeping cow and measure the muscular response to lateral disturbances, I'll wait. Someplace far away.

I'm sure you could factor this into a physics class somewhere, Marcus!

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