I don't know if this is your meaning but there is no such thing a pertetual energy. The energy "captured" from the friction is not free energy. It is only a "recovery" of some of the energy that was used in order to create the friction.
Originally Posted by AStudent
"The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
- Alexis de Toqueville, 1835