The law of conservation of energy describes how the amount of total energy can change in a closed system. Which of these statements correctly describes this law? The amount of kinetic energy in a system is a constant value. An object can have potential energy or kinetic energy, but not both at the same time. Energy can be converted from one form into another, but it cannot be created or destroyed. The amount of energy created when an object moves is equal to the energy destroyed when it stops moving.