Fill in the blanks
(a) Force is applied as ........... or .............
(b) On squeezing a gum tube, its ............ changes.
(c) On pulling a string, its ......... increases.
(d) A moving football when kicked, its.............. changes.
(e) On applying brakes on a moving car, its speed .............
(f) We use ball bearings to ............ the friction.
(g) Friction ........... the motion.
(h) Lubricants are used to ........... friction.
(i) Friction causes wear and tear of moving................