Conservation of energy

Conservation of energy is the fundamental principle that energy cannot be created or destroyed, only transformed from one form into another. For example, when you ride a bicycle downhill, the gravitational potential energy from your height converts into kinetic energy that makes you move faster, but the total amount of energy in the system remains constant. This concept is one of the most important laws in physics because it helps us understand how everything in the universe works, from tiny atoms to massive stars.