Answered

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Benny wonders why when he presses his finger against a map nothing
happens to the map. However, if he presses a thumbtack into the map using
the same force, the tack will probably poke a hole in the map. This is what his friends said was the reason:
Heather: I think it’s because the tack is made of metal.
Steve: I think it’s because your finger has more surface area.
Ashia: I think it’s because your finger is warm.
With whom do you agree most?
Explain

Sagot :

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The pressure exerted on a surface by an object increases as the surface area of contact decreases.

Explanation:

Pressure measures the amount of force exerted per a given area of an object. From this definition, the surface area of the object and force applied, affects the pressure applied.

As Benny presses his finger against a map, nothing happens to the map because the force applied is affected by the increased surface area of his finger. However as he presses a thumbtack into the map using the same force the tack will probably poke a hole in the map because the small( decreased) surface area of the sharp point of the thumbtack produces a much larger pressure on the map than the area of Benny finger. I hope this helps, thanks!

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