the law of convention of energy is nither created nor destroyed what does it mean?

Answer 1

Energy is neither created nor destroyed, but can change form.

If energy is moved into a different form, and can then be entirely recovered into the original form, we call it "mechanical energy."

If energy is converted into heat, it can NOT be fully recovered into the original form. Friction converts kinetic energy into heat; that heat can NOT be fully transformed back into kinetic energy. But the energy is still there, in the form of heat.

Answer 2

Convention Of Energy

Answer 3

Which word do you not understand?

Energy is neither created nor destroyed, it merely changes form.

It means that for any process, if you add up the energy you start with, it will be equal to the energy you end up with, only the form of energy changes.

Answer 4

it's conservation of energy, it means the net amount of energy in a closed system will remain the same, the energy can change forms but the total amount will remain the same.