“Force … equals … mass … times … acceleration,” muttered Ada as she wrote in her notebook. Ada pondered that if you drop a hammer on your foot, it hurts more than dropping, say, a sock on your foot. The acceleration, or speeding up, is the same, but the mass, the solid oomph of a thing, is different. Oomph times zoom equals kaboom!
― Jordan Stratford, The Case of the Missing Moonstone