This principle is directly equivalent to the time-invariance of a system's dynamics, which is why it is locally but not globally true on a cosmological level.
This principle is directly equivalent to the time-invariance of a system's dynamics, which is why it is locally but not globally true on a cosmological level. Early evidence for this principle came from an experiment in which a falling weight was used to heat up a container of water, performed by Joule. This principle proves that so-called "over-unity" devices do not exist. One version of this statement describes the change in internal energy as being the sum of heat input and work done. That version is the first law of thermodynamics. For 10 points, name this fundamental principle of physics, which states that the total amount of energy in a closed system is constant.
This principle is directly equivalent to the time-invariance of a system's dynamics, which is why it is locally but not globally true on a cosmological level.
conservation of energy [or conservation of mass-energy; accept first law of thermodynamics before it is read] 