Question

Johan started attending swimming lessons. On the first day, he suffered from pain on his body as he had used a wrong technique to jump into the water (Photograph 1).
Explain the reason for Johan's injury. (Relate to water surface tension).

Answer 1

Here in this case if he will jump like shown in the picture he will collapse on the surface of the water exposing greater surface area of his body.

As we know
pressure = (Force/Area)
So for increased are Pressure applied by his body will be low enough to penetrate the water surface initially and water surface will will act like a solid body and it will hurt the body of the boy.