Friction causes motion to stop. The energy that had been kinetic energy is dissipated as work is done against friction. The result is that the energy is converted to heat.
Energy cannot be destroyed or created. But it can end up as heat and blow away in the wind.
I hope this helps,
All kinetic energy (movement) causes friction, a force which dissipates energy as heat. Thus heat could be described as the ‘graveyard’ - it is where all kinetic energy ends up.
Most forms of energy can easily be transferred into another form, but it is hard to convert heat (particularly low temperature compared to the reservoir around it) into more useful forms e.g. electrical energy or potential energy. Thus heat is also described as a degraded form of energy.
There is one interesting (though not hugely efficient) process in this context called a ground-source heat pump which uses the ambient heat of damp (or wet) soil to power domestic heating systems.