It is always a good idea to understand the \"size\" of units. The objects listed

Question

It is always a good idea to understand the "size" of units. The objects listed below are resting on a hard surface. Categorize each object according to the pressure it exerts on the surface when placed on their side with the largest area, which is the bottom. Assume that the bottom of each object is flat and that the pressure refers to that above atmospheric pressure (that is, gauge pressure)

sheet of paper, penny, can of soup, textbook, brick

0.01pa, 0.1pa, 1pa, 10pa, 100pa, 1000pa, 10000pa, 100000pa

Explanation / Answer

A. Let us see.

P = Force/ Area. So,

textbook has a mass of say 1 kg, area of 30*30cm^2. Pressure = 100 Pa

brick mass = about same as textbook (In my country bricks are light, but might consider changing mass for your country :D)

= 100Pa

can of soap = 1 kg, 20 cm radius = 100 Pa

sheet of papaer = 2 grams, same area as textbook = 0.01 Pa

penny = 2.5g, 10mm = 10Pa

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