A device used to assist braking that does not use friction.
Brakes may be broadly described as using friction, pumping, or electromagnetics.
Friction jaws use all the force of the gripper to hold the object in place using friction.
Encompassing jaws cradle the object in place, using less friction.
Another simple fire making tool using friction is a fire plough.
However, instead of simply climbing up hand-over-hand, you must bounce across the gap between two buildings using only momentum and friction.
In particular, wheels use static friction - the force between two unmoving objects.
It is typically an object "sawed" against a piece of wood, using friction to create an ember.
The next morning they were unable to start a fire using friction due to the thin air at that altitude, and sent for matches.