Physics: Understanding th... (2014)
by Britannica Educational Pub
However, the amount of matter in a system, like the amount of energy, is also conserved unless some of the matter is changed to energy or some of the energy is changed to matter. To take account of such changes, the law of the conservation of energy is combined with the law of the conservation of mass to form an expanded law of the conservation of mass-energy. The simplest examples of the conservation of energy are provided by systems in which only mechanical forces are acting. A swinging pendulum, such as the monkey swinging on the vine in the rainforest, continually interchanges kinetic and potential energy.🏁
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However, the amount of matter in a system, like the amount of energy, is also conserved unless some of the matter is changed to energy or some of the energy is changed to matter. To take account of such changes, the law of the conservation of energy is combined with the law of the conservation of mass to form an expanded law of the conservation of mass-energy. The simplest examples of the conservation of energy are provided by systems in which only mechanical forces are acting. A swinging pendulum, such as the monkey swinging on the vine in the rainforest, continually interchanges kinetic and potential energy.🏁