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When you compress a spring, like the one in the click mechanism of a ballpoint pen, you’re using the force (the physics version, F = -kx, not the “Star Wars” version, sorry) to push the spring in, and this force, exerted over a distance, gives you work—which, as we covered in February, is measured in the same units as energy: joules.…
Potential energy is the energy stored in an object because of its position, condition or state. It’s the energy of anticipation, the calm before the storm, the coil in the spring, the water held back by the dam, the double-A battery fresh from the factory, the caterpillar before the butterfly, that butterfly and all his friends and relatives in your stomach right before the roller coaster’s plunge.…