The remaining energy is lost as heat due to the 2nd law of
thermodynamics. According to that law, only part of the energy will
transfer and the rest will be lost as heat. For example, and engine
uses part of the energy for motion and the rest dissipates through
Unless the object has some internal components capable of
storing energy (such as a compressing spring), the energy of an
object at rest is the energy associated with the object's mass (or
rest-mass to be exact).