Sources of Thermal Energy
Mechanical Forces
Mechanical Forces are the forces that push and pull objects, which releases thermal energy. Thermal energy (heat) is produced by either friction or the compression of air.
Have you ever balled so hard your feet got hot through your shoes? Maybe you were having a wicked badminton match and your shoes got hot? Maybe floor hockey? Beep test? Either way the friction between your shoes and the floor can make your shoes hot. This thermal energy is from the mechanical force of friction between your shoes and the floor.
When you apply the brakes on your bike, or your parents apply the brakes in their cars you stop due to the friction the brake pad creates. There is also thermal energy given off due to this friction so the brakes become hot. This is another example of a mechanical force producing thermal energy