Fill in the blanks. [Choose from the given words: heat, reduces, motion, less, nature]
(a) Friction opposes the ________between the surfaces in contact with each other.
(b) Friction depends on the _________of surfaces.
(c) Friction produces _________.
(d) Sprinkling of powder on the carom board ________friction.
(e) Sliding friction is ________than the static friction.