The Law of Conservation of Energy states that energy can neither be created nor destroyed, only transferred or transformed from one form to another. This means that the total amount of energy in a closed system remains constant over time.
An example of how the law of conservation of energy applies to everyday life is the use of a simple pendulum. When a pendulum swings back and forth, it continuously converts between kinetic energy and potential energy. At the highest point of its swing, the energy is entirely potential because the pendulum has reached its maximum height, and its velocity is zero. At the lowest point of the swing, the energy is entirely kinetic because the pendulum has reached its maximum speed, and its altitude is zero. However, the sum of kinetic and potential energy at any point remains constant. This conservation of energy is the reason why the pendulum oscillates indefinitely if it is not subject to any external forces.