Energy in motion.

• A. Electric Energy
• B. Kinetic Energy
• C. Potential Energy
• D. Thermal Energy

Answer: (B)

Energy in motion is kinetic energy—the energy a moving object has simply because it is moving. This form of energy depends on both how heavy something is and how fast it’s going, with the speed playing a big role because it’s squared in the formula KE = 1/2 m v^2. That means pushing an object to go faster raises its kinetic energy a lot more quickly than just increasing its mass.

For example, a 2 kg ball traveling at 3 m/s has kinetic energy of 0.5 × 2 × 3^2 = 9 joules. If it speeds up to 6 m/s, its kinetic energy becomes 0.5 × 2 × 6^2 = 36 joules—the energy increases fourfold with speed, even though the mass is the same.

This concept contrasts with potential energy, which is stored due to position (like a ball held above the ground) rather than motion, and with thermal energy, which relates to the microscopic jostling of particles inside a substance and is tied to temperature rather than the motion of a single object. Electric energy covers energy related to electric charges and fields, which can be stored or in motion in circuits, but when we talk about energy in motion in everyday terms, we’re referring to kinetic energy. When moving objects slow down and stop, their kinetic energy is transferred to other forms, such as sound, heat, or deformation.