Here's why:

* Heat and Temperature: Heat is the transfer of thermal energy between objects. Temperature is a measure of the average kinetic energy of the particles within an object.

* Particle Motion: When you add heat to a substance, the particles absorb that energy. This absorbed energy increases the kinetic energy of the particles, causing them to move faster, not slower.

Think of it like this: When you heat up a pot of water, the water molecules start moving around more vigorously. This increased movement is what makes the water feel warmer.