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 …………… motion.

(h) Lubricants are used to …………… friction.

(i) Friction causes …………… of moving parts of a machine.

(a) Force is applied as push or pull .

(b) On squeezing a gum tube, its shape changes.

(c) On pulling a string, its length increases.

(d) A moving football when kicked, its direction of motion changes.

(e) On applying brakes on a moving car, its speed slows down .

(f) We use ball bearings to reduce the friction.

(g) Friction opposes motion.

(h) Lubricants are used to reduce friction.

(i) Friction causes wear and tear of moving parts of a machine.