What is the law of energy conservation?

Answer 1

energy is neither created or destroyed. in a closed system energy is always constant.

Answer 2

Conservation of energy states that the total amount of energy (including potential energy) in an isolated system remains constant. In other words, energy can be converted from one form to another, but it cannot be created or destroyed. In modern physics, all forms of energy exhibit mass and all mass is a form of energy.

The energy conservation law is possibly the most important, and certainly the most practically useful, of several conservation laws in physics. The main reason is that energy, as defined via mechanical work, is force times distance, and civilization needs to exchange by goods and build various structures and machines - both required to transport matter over distance against dissipating forces (friction, air or other medium resistance, etc).

In thermodynamics, the first law of thermodynamics is a statement of the conservation of energy for thermodynamic systems.

The energy conservation law is a mathematical consequence of the shift symmetry of time; energy conservation is implied by the empirical fact that physical laws remain the same over time.

Answer 3

The First Law of Thermodynamics and the last law
of Marriage. If you want to conserve energy your wife will lay the law and call you lazy bum. Women don't believe in this law at all, I wasted hours trying to prove I was conserving energy and all I
got is whacked with a broom. Women waste energy with
invidious generosity, they just don't approve of the beer, couch, TV, thing!

Answer 4

It means that the total energy in the universe remains constant from the day of its creation. This law has never been proven nor can it ever be proven expreimentally as nobody has done an accounting of all the energy in the universe. Nevertheless, it is taken as true.

Answer 5

The conservation refers to the sum of energy and mass, because mass and energy can transform into each other.
Nothing is created (not anymore?) or destroyed, everything can be transformed but the total does not change.

Answer 6

A sidelight to your question concerns the force of gravity. In that gravity performs work, and an energy source is required to preform work, what is the energy source that forms a gravitational field? http://360.yahoo.com/noddarc

Answer 7

Hi. That energy may neither be created nor destroyed. It can change forms and is interchangeable with mass.