Final answer:
The measure of average kinetic energy of all the particles within an object is called thermal energy. It reflects how vigorously the particles of a substance are moving and is directly related to the substance's temperature.
Step-by-step explanation:
The measure of average kinetic energy of all the particles within an object is called thermal energy. At any given temperature, particles within a substance may have different kinetic energies, resulting in a distribution of speeds and energies. Most particles will have kinetic energies around the average with only a few having much higher or lower kinetic energies. This average kinetic energy is proportional to the temperature of the substance and is an indication of how vigorously the particles are moving and colliding with each other.
It's important to note that while kinetic energy is related to the motion of a single particle, thermal energy refers specifically to the collective kinetic energies of a substance's constituent particles. It is part of the total internal energy of a system, which also includes potential energy. Nevertheless, when we talk about internal kinetic energy, we are addressing the sum of the kinetic energies of all the objects or particles within the system.