Question

It is difficult to walk bare feet on a sandy ground as the sand:
A. Is coarse, rough and irritating and gets everywhere
B. Flies away
C. Has crabs hiding in them
D. Yields under our weight

Answer 1

We know that friction is the cause which lets us walk on a surface. Friction helps us to walk on slippery surfaces also. We can add something to increase the friction on sandy ground.

Complete step-by-step solution:
When we walk barefoot on the sand, the sand yields under our weight. We do not get proper reaction from sand which is necessary for our walking. This proper reaction which is needed for our walking is the frictional force. Friction helps us to walk.
Hence, it is difficult to walk bare feet on a sandy ground as the sand yields under our weight.
Therefore, option D is correct.

Additional Information: -
This difficulty can be overcome by spreading the wooden dust on the sand. This adds the thrust on the sand due to our weight will spread over the whole area. So, a very small pressure is exerted on the sand. Due to this, the sand does not yield.

Note:- In this question, we have to keep in mind that we are able to walk on a surface due to friction. The more the friction(reaction) is, the less the slipperiness(yield) of the surface. If a surface has less friction then we can add some material or objects which can increase the friction. Such as we can increase the friction of a muddy area by adding some sand into it to increase the friction.We can use rubber footwear to walk on the wet floor as rubber footwear increases the friction between our barfoot and the wet floor.