Principle of Conservation of Energy
Total energy of an isolated system always remains constant. Since, the universe as a whole may be viewed as an isolated system, total energy of the universe is constant. If one part of the universe loses energy, then other part must gain an equal amount of energy. The principle of conservation of energy cannot be proved as such. However, no violation of this principle has been observed.
When we rub two flint stones together, got them to heat up and to ignite a heap of dry leaves in the form of
Options:
(a) chemical energy
(b) sound energy
(c) heat energy
(d) electrical energy