Which two forms of energy are described as kinetic energy and potential energy?

• A. Thermal energy
• B. Kinetic energy and potential energy
• C. Electrical energy
• D. Chemical energy

Answer: (B)

Energy can be categorized by form. In mechanics, kinetic energy is the energy of motion, while potential energy is the energy stored due to position in a field (like gravity). Together, they make up mechanical energy—the sum of kinetic and potential energies. The phrase describes these two specific forms, emphasizing how energy can transfer between motion and position without changing the total (in the absence of friction). For example, a swinging pendulum converts potential energy to kinetic energy as it moves downward and back to potential energy as it rises, keeping the total energy constant. Other forms like thermal energy (related to temperature), electrical energy (associated with electric charges and fields), or chemical energy (stored in chemical bonds) are different categories and aren’t the pair described here.