Back. To quantum physics.
Attention! I don't know English. Google translation. Hobbies are the philosophy of time.
(c) Temperature is related to electromagnetic radiation. Electromagnetic radiation occurs when an electron moves from a high, to a low orbit. Consequently, the temperature of the body is one, with the rotational energy of the electrons of the atom. Let's consider the differences between thermal, kinetic and potential energy of the body. Kinetic and potential energy is a vector. Temperature, a scalar characteristic. Having energy of motion, and not having a vector, allows rotation. Conclusion: temperature is the rotational energy of the electrons and nucleus of the atom. Vector, is transformed into rotation if the vector is "bound" to a point moving slower than the body. Braking, when sliding, creates a rotation of the atoms in the contact area, creating an increase in temperature at the surface. The result: Sliding down an inclined surface, the potential energy of the bar, is transformed into the thermal energy of the contact molecules. The impact creates interatomic interaction and the transformation of kinetic energy, into thermal energy, occurs throughout the body volume.