Using the law of conservation of energy, explain why you become tired from pushing your bicycle along the road

Energy cannot be created or destroyed (except in nuclear reactions). It can be stored and converted from one kind of energy into another, and it can move from one place to another. It takes energy to move your bicycle. Where does the energy to move your bicycle come from? Where does it go?

The law of conservation of energy is right. When you push your bicycle or you run or play, it is the glucose in your body (blood) which is chemically decomposed in exothermic reactions (where energy is released in a chemical reaction) to give energy. This change in the body brings two effects: 1. Some acids are produced which give a feeling of burn to the muscles. 2. Glucose level in the blood is decreased and so production of energy is gradually decreased which gives the feelings of tired ness. What this all to law of conservation of energy? The energy produced in your body is transformed in different shapes (mostly kinetic energy) out of your body and so your contents of potential energy are reduced.