question_answer

Which of the following statements is correct?

I. A force can change the direction of a moving ball.

ii. An iron object is repelled by a magnet when it is brought near it.

iii. A smooth surface produces more friction as compared to a rough surface.

iv. Friction between our feet and the ground makes it possible for us to walk.

A) i and ii  

B)        i and iv

C) ii and iv

D)        Only iv

E) None of these