Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.
(Friction; produces; heat; because it causes the molecules on rubbing surfaces to move faster and have more energy) (it; causes; the molecules on rubbing surfaces to move faster and have more energy) (surfaces; to move faster; ) (surfaces; to have; more energy)
Friction it surfaces surfaces
produces causes to move faster to have
heat because it causes the molecules on rubbing surfaces to move faster and have more energy
the molecules on rubbing surfaces to move faster and have more energy
more energy