A spinning wheel is brought in contact with an identical wheel spinning at the identical speed. The wheels slow down under the action of friction. Which of the following energies of the first wheel decrease?

• when the body is in motion, it will exhibit kinetic energy. If the speed is decreased, then the kinetic energy will be decreased.

• Mechanical energy is the sum of both potential and kinetic energies. Due to a decrease in kinetic energy, mechanical energy also decreases.

• If the wheel gets slowdowns due to friction the mechanical energy is converted into internal energy leads to an increase in internal energy.