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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.