The other day I was talking with a friend about words that people use in ways that show they don’t understand their meaning. I’ve talked about some before, such as “phobia” and “exponential.” Here are some more.

ballistic: A ballistic course is one followed by an object that isn’t under acceleration except by gravity. The laws of physics say it follows a parabola, moving horizontally at a constant rate and being vertically affected by a constant force (assuming it doesn’t go so high that gravity significantly weakens). Someone who “goes ballistic” is enraged and suddenly follows a different course. A truly ballistic person would coast along and follow a smooth course, eventually coming back down to earth.

quantum: Quantum effects occur at a sub-microscopic scale. A quantum leap, properly, is the smallest change a particle or system can undergo, yet people use “quantum leap” to mean a huge, sudden change.
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