State the principle of conversation of energy. What are various energy transformations that
oocur when you are are riding a bicycle?

Conservation of energy:

Conservation of energy means energy can neither be created nor destroyed but can be transferred from one form to another form. 

Conversion of energy:

Change of energy from on form to another form. 
 

While riding a bicycle, the muscular energy of the rider gets transferred into heat energy and kinetic energy of the bicycle. Heat energy heats the rider’s body. Kinetic energy provides a velocity to the bicycle. The transformation can be shown as:

During the transformation, the total energy remains conserved.