Define 'state of motion' of an object. Name the 'agent' which can change the state of motion of an object.

State whether the following statements are true or false :

(a) The pressure exerted by a liquid depends on the area of base of its container.

(b) A drinking straw works on the pressure exerted by the liquid filled in a soft drink bottle in which it is placed.

Fill in the following blanks with suitable words :

(a) To draw water 'from a well, we have to .............at the rope.

(b) If the two forces applied to an object are equal and act in opposite directions, the net force acting on the object will be ................

(c) Force could be a .............or a ...........

(d) Force has magnitude as well as ..............

(e) A force arises due to................between two objects.

(f) A charged body............an uncharged body towards it.

(g) The north pole of a magnet............the north pole of another magnet.

(h) Force acting on a unit area is called ..................

(i) The pressure exerted by a liquid ..........with depth.

(J) A drinking straw works on the existence of ...................pressure.

(k) Atmospheric pressure.............with increasing height.

Give two examples of situations where you push or pullto change the state of motion of objects.

What is meant by saying that force is due to an interaction'? Give an example to illustrate your answer.