For 10 points, name this quantity, the ability of a system to do work, which can be potential or kinetic.
The average value of this quantity is related to the temperature of a substance by the equipartition theorem. In thermodynamics, the change in this quantity is equal to the heat added minus the work done by the system. Its value for a photon is Planck's constant times frequency. The total form of this quantity is represented by the Hamiltonian operator. One type of this quantity can be found on earth by taking the mass of the object times little-g times the height. For 10 points, name this quantity, the ability of a system to do work, which can be potential or kinetic.
The average value of this quantity is related to the temperature of a substance by the equipartition theorem.
energy [accept kinetic energy; or potential energy; or internal energy]