Which term best describes energy associated with motion?

• A. Kinetic energy
• B. Potential energy
• C. Thermal energy
• D. Chemical energy

Answer: (A)

Energy you can attribute to motion is known as kinetic energy. Whenever something moves, its motion embodies energy that can do work—how much depends on its mass and its speed. A heavier object moving quickly contains more kinetic energy, and when it slows down, that energy can be transformed into other forms like heat or sound. The relationship KE = 1/2 m v^2 shows why speed matters so much: increasing velocity has a big effect on the amount of energy.

The other terms describe different kinds of energy. Potential energy is energy due to position, not motion—think of an object held up high or stretched springs. Thermal energy comes from the random motion of particles inside a substance and relates to temperature, not the motion of a single object. Chemical energy is stored in the bonds of molecules and is released during reactions, not simply from moving. So the best fit for energy directly tied to motion is kinetic energy.