Frictional

a.

1.

Relating to friction; moved by friction; produced by friction; as, frictional electricity. Frictional gearing wheels which transmit motion by surface friction instead of teeth. The faces are sometimes made more or less V-shaped to increase or decrease friction, as required.

Adj.

1.

frictional - pertaining to or worked or produced by friction; "frictional electricity"; "frictional heat"; "frictional gearing"

friction, rubbing