Final answer:
The energy of motion is directly transformed into heat due to kinetic friction between two moving surfaces in contact.
Step-by-step explanation:
Friction between two surfaces transforms the energy of motion directly into heat. This phenomenon occurs due to the kinetic friction when objects are in contact and moving relative to each other. The energy transformation is exemplified when car brakes convert the kinetic energy of a moving car into thermal energy, causing them to become very hot. Similarly, when you clap your hands or rub ice against a surface, the friction generates heat energy from your hands' motion or the ice's motion, respectively.