On a sunny day, there was a plant. It was growing and being nourished by the sun, gaining nutrients and sugars. This shows light energy giving the plants nutrients and sugars.
One day that plant turned into an apple! John was about to run a 5k race and needed some energy. He decided to eat a nutritious apple . This shows chemical energy because the apple has energy to give to John.
John had enough energy to complete his race, and he even got first place! This shows mechanical energy because the apple gave John enough energy to run his race.