A ball rolled on four wooden surfaces of different roughness when a similar push was applied on it. The graph shows the distance travelled by the ball on the surfaces over time
Which of the following conclusion is/are correct?
(i) Different magnitudes of the friction were produced when the ball was rolling on different wooden surfaces.
(ii) Surface Q is rougher than surface R.
(iii) Surface S has the least roughness.

Options

A. {i) only
B. (ii) only
C. (iii) only
D. (i) and (iii) only

Answer

A

Explanation

The magnitude of friction depends upon the nature of the surface.
The more will be roughness of the surface, lesser will be the distance travelled by the ball.
`therefore` S has the most and P has the least roughness.