Question

please give correct reasons ​

Answer 1

Answer:

a) to increase friction due to more no. of spikes in it.

b) by keeping big piece of cloth on head the friction with head so the heavy loads don't fall.

c) sharp has less surface area than a blunt knife. so pressure increases in the small area which cut the vegetables.

D) same as in (c) but in oppositely

e) due to small area of needle pressure increases

f) due lower pressure in atmosphere and high pressure in lungs.

g) to maintain the required pressure inside the aeroplane.