Question

In a competition cutting vegetables, one person could cut the vegetables easily while the second person faces a problem in cutting the vegetables. He found his knife was blunt but the knife of the first person was sharp.

(i) Name the physical quantity responsible for it.

(ii) What is its SI unit?

(iii) Justify the problem faced by the second person.

Answer 1

1. The physical quantity responsible for this condition is Pressure.
2. SI unit for pressure is $\raisebox{1ex}{$N$}\!\left/ \!\raisebox{-1ex}{$m^2$}\right.$
3. We know that pressure is inversely proportional to the area, as the knife used by a second person has a blunt surface so the pressure applied by the second person is less than the first person.