How do you get ketchup out of a newly opened bottle? According to anthropologists, Neanderthal man would turn the bottle upside down and, grunting, pound the bottom of the bottle with his fist. Cro-Magnon man, slightly more advanced than the Neanderthal but still something of a brute, would shove a table knife into the bottle to pull the ketchup out — effective, but uncouth. It would be nice to say that the human race has advanced since then. But the next time you visit your friendly neighborhood diner, look around, and decide for yourself whether that's true.
The ketchup-pouring problem, like many of life's practical problems, can be solved by applying high-school physics, specifically Newton's First Law of Motion. My technique: hold the base of the ketchup bottle in your left hand, upside down, at a 45-degree angle. Bring the bottle downward at that same 45-degree angle, letting the angled part of the bottle (just below the bottle neck) hit your right hand. When the moving bottle hits your right hand, it comes to an abrupt stop. But the ketchup inside the bottle keeps moving forward, for the same reason that the unbuckled occupants of a car keep moving forward when the car hits a brick wall. See Newton's First Law. Result: the ketchup comes out in direct proportion to how hard the bottle smacks into your right hand: a little tap for a little bit of ketchup; a hard smack for a large, messy glob.
For another ketchup-pouring technique grounded in physics, visit Bob's Diner, and click on Bob's technical explanation for pouring ketchup. Bob's technique, like mine, brings the moving bottle to an abrupt stop while the ketchup inside tries to keep moving. Newton's First Law.
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