Question

5 example in which pressure increase with decrease in contact area.

Answer 1

5 example in which pressure increase with decrease in contact area are:-

1.A sharp knife cuts more effectively than a blunt knife as it has a very small  surface area and exerts more pressure.

2.A nail has a pointed edge so that it exerts more thrust or pressure.

3.Tip of a sewing needle.

4.Edge of an arrow.

5.Edges of tools used to pierce things.

Answer 2

EXAMPLES OF PRESSURE​ :


→ The Tip of a sewing needle is made sharp, so as to put large pressure on a very small area of cloth.

→ A nail has a pointed tip, so that when it is hammered, the force of hammer falls on a very small area of wood or wall to create a large pressure which penetrates the nail into wood or wall easily.

→ It is easier to cut an apple from the sharper side than blunt because, the sharper side has a large area.

→ it is difficult for us to walk on sand, because our feet sink into it. on the other hand , a camel which is much heavier can easily walk on sand . This is because a camel has a broad feet. The weight of the camel is spread over the large area covered by its feet. Thus, the pressure exerted by its body on the sand is less.


→ The tyres of buses and trucks have broad and double wheels, so that the pressure on the tyres is reduced and they do not brust. The bigger the wheels, the less is the pressure on them, so that they can carry greater weight.


→ A Porter's wear turbans while carrying heavy loads . By doing this pressure on their heads gets reduced due to the increase in area of contact.

→ The skies used by skiers are long and flat which reduce the pressure on the snow. this makes the skiers to slide over the snow easily and their feet do not sink in the ground.

→ A woodkeeper hammers at tree trunk with it's beak which is sharp, pointed and long . The force falls on the small area at the tip of it's beak . hence, due to it's large effect it can make a hole in the wood very fast.

→ The foundation of high rise buildings are kept very wide, so that the weight of the buildings produces less pressure on ground and the building may not sink into the ground.


→ A school bag has a wide strap made of thick cloth so that the weight of bag falls over a large area of the shoulder of the child.
This produces less pressure on the shoulder and hence the child can carry heavy school bag more comfortably.

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BEST OF LUCK ;-)

#akashmandal