Question

Arrange the level of difficulty of walking on the following surfaces in increasing order
a.On wooden floor
b.On concrete floor
c.On wet marble
d.On dry marble

A.c < b < a < d
B.d < c < b < a
C.b < a < d < c
D.a < d < c < b

Answer 1

Hint: The force of friction helps us in walking. We push our feet backward while walking. An equal and opposite force is applied by the surface on our feet that enables us to walk. The greater irregularities on a surface, the greater force of friction is offered. Greater the force of friction on a surface, the lesser the difficulty in walking.

Complete step by step answer:
c < b < a < d – It is more difficult to walk on a wet marble than concrete as wet marble offers the least amount of friction. Hence, option A is incorrect.
d < c < b < a – It is more difficult to walk to dry marble and wet marble than on a concrete floor as marbles offer less friction than concrete. Hence, option B is incorrect.
b < a < d < c – A concrete floor is most irregular. Hence, it offers the greatest amount of friction and is, therefore, easiest to walk on. Wooden floor offers less friction than concrete. Dry marble offers lesser friction than the wooden floor and wet marble offers the least. Hence, option C is correct.
a < d < c < b – It is more difficult to walk on the wooden floors and dry marble than concrete floor as concrete floor offers more friction than the wooden floor and dry marble. Hence, option D is incorrect.

So, the correct answer is “Option C”.

Note: It is more likely to slip on smooth surfaces than offer less friction than irregular surfaces that offer more friction.