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There are many different laws of conservation, but they are essentially the same. For this example I will use energy. The laws of conservation of energy say that energy in = energy out. This is to say that energy cannot be destroyed or created.
No.
It applies in the sense that you can NEVER get energy where there was none before, and you can NEVER destroy energy completely.
the law of conservation of energy says that the ball will never have as much kinetic energy as it originally had
The total amount of energy in any process will neither increase nor decrease.
The law of conservation of energy states that energy cannot be created or destroyed. An example refers to throwing a ball in air, it will come down with the left speed that it left your hand.
Converting of electric energy in to machnical energy when we switch in yhe fan
"Conversation of energy" is a good non example of 'conservation of energy'
The law of conservation of energy states that the total energy in the universe is a constant and will remain so for example ( x=y+z ). conservation of energy has to do with reducing the amount of energy used through reduced activity and/or increased efficiency in the performance of a particular task.
Chemical potential energy converting to heat energy -apex
The correct term is "conservation of energy". It either refers to making efforts not to waste energy, or to the physical law which states that under everyday circumstances, energy can't be created or destroyed.
Conservation has two definitions that I know of in this category. One is in scientific laws like conservation of angular momentum or conservation of energy. Conservation in this sense means that that element can't be created or destroyed. Conservation of energy, for example means that energy isn't created or destroyed, but rather it changes form (like from chemical energy to heat). The other conservation is like wildlife conservation which includes programs where people try to conserve the Earth's resources, wildlife, etc.