In a large commercial complex there are four ways to reach the main road. One of the path has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is
Paheli is least likely to slip on gravel surface because:
⇒ The surface of gravel is rough.
⇒ Friction increases when a surface is rough.
⇒ Thus, there will be enough force of friction for her to walk easily without getting slipped.