Write true or false for each statement :

(a) The frictional force acts in the direction of motion of body.

(b) The unit of weight is kilogram.

(c) A force can change the direction of motion of a moving body.

(d) A force increases the mass of the body when applied on it.

(e) The force of friction is always disadvantageous.

(f) The sliding friction is more than the rolling friction.

(g) Liquids offer more friction than the gases.

(h) A wet oily road offers more friction than a dry rough road.

Match the following columns :

Give one example each of a force as

(i) a push,

(ii) a pull,

(iii) a stretch and

(iv) a squeeze.

Explain the meaning of the term force.