A person can lie on a bed of nails ( if there is a large number of nails) without any
discomfort. But when he is made to lie on a single nail it pains him a lot ?. Answer the
following questions based on this concept
i) Why it pains a lot when the person is made to lie on a sharp single nail ?
ii) Write the formula relating pressure, force and area
iii) If the nail have a blunt edge then what effect it would have on the person ?
iv) The above mentioned activity should not be tried by children. Why ?
v) What do you understand from the above mentioned activity ?
Pls don't give answers like I don't know. Bcs this is there for my exam in just 15 mins exam is starting so pls a bit fastlu can u send someone.....
Answers
Explanation:
The force produced by the man's weight is distributed over hundreds of nails of the nail bed. Therefore, the force applied by individual nail is reduced. ... The nails do not penetrate in the man's skin and he does not get hurt. Thus, a person can lie on a bed of nails if there are very large number of nails.
Answer:
i)It appears to the spectator that anyone lying on this "bed" would be injured by the nails, but this is not so. Assuming the nails are numerous enough, the weight is distributed among them so that the pressure exerted by each nail is not enough to puncture the person's skin.
ii)P=FA P = F A . The SI unit of pressure is pascal and 1 Pa=1 N/m2 1 Pa = 1 N/m 2 .
iii)The pressure is defined as the force per unit area. i.e P=F/A
So the pressure depends on the force F and area A of contact.
As sharp tipped nail has very small area of contact than a blunt nail (not sharp), so it will give more pressure when a small force is applied.
iv)