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Pressure

When a force ...

Question

When a force acts on a large area, the pressure it exerts is more.

A

True

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B

False

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C

Ambiguous

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D

Data insufficient

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Solution

The correct option is B False
Answer is B.

The same force acting on a smaller area exerts a larger pressure, and a smaller pressure on a larger area. This is the reason why a nail has a pointed tip, knives have sharp edges and buildings have wide foundations.
For example, When standing, a person will sink more into sand than when he lies flat stretched on sand. The body weight acts on a smaller area, in standing position, than when the person lies stretched over a larger area.
Hence, the statement is false.

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Q. Indicate whether the following are true or false. Rewrite the false statements correctly.
(a) If we apply the brakes to a moving car, it comes to rest. This shows that force can make a moving object go slower.
(b) When a force of 1 N acts on an area of 1 m² , the pressure exerted is equal to one Pascal.
(c) The foundations of high rise buildings are kept wide so that they exert less pressure on the ground and prevent the building from sinking into the ground.
(d) A boy throws a ball down from the second floor of a building. In this case, gravitational force is acting only on the ball.
(e) Friction helps us to walk more easily on a smooth, highly polished surface.
(f) An old truck tyre will cause more friction with the road than a new tyre.
(g) In the frozen northern regions of Canada, the Eskimos wear large snowshoes as that helps them to walk on freshly fallen snow.
(h) When a force acts on a large area, the pressure it exerts is more.
(i) Gravity and friction are both contact forces.

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