Kinetic energy is due to the speed or movement of the particles. When an object is heated, the particles in it absorb the heat energy and as a result, the speed of the particles increases.
Average kinetic energy of the particles or of a system is directly proportional to the absolute temperature.When the temperature is lowered, the speed decreases and as a result kinetic energy also decreases.
When the temperature increases, the speed of the particles increases and hence kinetic energy also increases.
