Pressure is calculated in; Force divided by surface area. Force is measured in Newtons and surface area in meteres squared. Pressure is measured in Newtons per metre squared, Newtons per centimetre squared, or pascals.
Q.a.)A fireman has a mass of 100g. he has to rescue a cat from a frozen pond. The ice will crack if the pressure exceeds 25,00 Pa. His shoes have a surface area of 20cm squared each. Will the ice break if he walks on it?
A.a.) Yes. The pressure exceeds 25,00 pascals.
Q.b.)The fireman uses a plank instead, with a surface area of 5m squared.Can the fireman rescue the cat from the pond without breaking the ice?
A.b.) Yes. Because his weight is spread evenly over a wider area, unlike his shoes.
The fireman finally rescued the cat from the pond because he figured out that using a board would spread his weight evenly over a larger surface area. The same can be saidif your hand was stood on. Would you prefer a flat wide shoe, which spreads the person's weight out over a large area, or a stilletto heel with a sharp point, which concentrates the wearers weight into one small area? Personally, i would go for the wide shoe.
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