Which of the following is a form of energy?

• A. Kinetic Energy
• B. Mass
• C. Volume
• D. Density

Answer: (A)

Energy is the ability to do work, and it comes in different forms. The form tied to motion is kinetic energy: the faster something moves, the more kinetic energy it has, and that energy can be transformed into other forms (like heat) when the object changes speed. The other terms describe what the matter is like rather than an energy form: mass is how much matter there is, volume is how much space it occupies, and density is how tightly the matter is packed. They are properties of matter, not ways to describe energy. So the moving object’s kinetic energy is the form of energy present.