Question

When you see your teachers carrying heavy notebooks you volunteer to help by carrying

them yourself. If the dimensions of the notebook are 15m x 20cm and they weigh 12N.

Calculate the pressure the notebooks will exert on your hands.
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Answer 1

Answer:

THE RIGHT ANSWER IS 1/25 OR 0.4 Pa (Pascal)

Explanation:

As we Know PRESSURE = FORCE / AREA ON WHICH IT ACTS

HERE, Area = 15*20

                    =300 cm^2

and,    Force = 12 N (Newtons)

So, the pressure will be = 12/300

                                        =1/25 or 0.4   (answer)

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Answer 2

The pressure that is exerted by the notebook on his hand is equal to 4 Pascal

Explanation:

The pressure can be defined as the force exerted per unit surface area.

Given,

• The dimension of The notebook = 15m x 20cm = 3m²
• The force due to the weight of the notebook is equal to 12 Newton.
• Pressure = force/ area = 12/3 = 4 Pa

hence pressure is directly proportional to the force applied and inversely proportional to the area of cross section

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