Final answer:
The law of conservation of energy states that energy is neither created nor destroyed, but only transferred from one form to another. An example of this is a roller coaster where potential energy is converted into kinetic energy during its ride.
Step-by-step explanation:
The law of conservation of energy states that in any physical or chemical process, energy is neither created nor destroyed. It can only be transferred from one form to another. This means that the total amount of energy in a closed system remains constant.
For example, imagine a roller coaster at the top of a hill. As it moves down the hill, the potential energy it had at the top is converted into kinetic energy. At the bottom of the hill, the kinetic energy is at its maximum, but the potential energy is the lowest. However, the total energy of the roller coaster (the sum of potential and kinetic energy) remains the same throughout the ride.