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Understanding terms that describe motion helps you pick the right word quickly. The term that means pertaining to motion is kinetic. It comes from the idea of movement and is used in physics to describe things in motion, like kinetic energy—the energy something has because it is moving—and kinetic theory, which explains how particles move in gases.

Latent refers to something hidden or dormant, not active motion. Internal means located inside or within. Lethargic describes a state of sluggishness or low energy, not motion itself. So kinetic is the one that specifically ties to motion.