Question

10. Explain the following:
(a) It is easier to cut with a sharp knife than with a
blunt one.
(b) Sleepers are laid below the rails,please only (b) one​

Answer 1

Answer:

(1) The pressure exerted by the sharp knife edge is more than that exerted by the blunt one because the area one which force is exerted with a sharp knife is very small. Thus, it is easier to cut with the former than with the latter..

(2) Sleepers are laid below the rails so that the weight of passing train in spread over a large area (which decreases pressure) and the track may not sink into the ground...