Various forms of energy
Heat: The work done by friction is not‘ lost’, but is transferred as heat energy
Chemical Energy: o
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Chemical energy arises from the fact that the molecules participating in the chemical reaction have different binding energies.
If the total energy of the reactants is more than the products of the reaction, heat is released and the reaction is said to be an exothermic reaction. Example- When you freeze water you remove energy from water to lower its temperature and its phase is changed to ice, so it is a exothermic process