Kinetic energy is best described as the energy of what?

• A. Motion
• B. Position
• C. Temperature
• D. Flow of Energy

Answer: (A)

Kinetic energy is the energy an object has because it is moving. It depends on mass and speed (KE = 1/2 m v^2), so heavier objects and faster objects store more of this energy. This energy is what can be converted to other forms when the object slows down or stops, such as during a collision or when a moving car comes to rest. It’s different from potential energy, which comes from position, and from temperature, which describes how vigorously particles are vibrating on a microscopic scale rather than the energy of a specific moving object. The phrase “flow of energy” refers to how energy is transferred, not the stored energy itself. So the energy described by kinetic energy is energy of motion.