Question

the pressure of the nail was measured as 650 pa. what force is exerted by the nail if the surface area is 15 cm².​

Answer 1

Answer: Pressure is defined as the force exerted (on a surface) per unit surface area.   Pressure is a scalar.  

P = F / A,      Its unit is Pascal = Newton / meter².   There are also some other units in use for pressure.

1)   F = P * A = 50, 000 Pascals * 0.5 meter =  25, 000 Pascals or N/m²

2)  Surface Area A = Force / Pressure = 100 N / 500 pa  = 1/5 m²  

3)  Area = 30 cm² = 30 / (100*100)  meter²

    Pressure = F / A = 300 N / (3/1000) = 100 * 1000 pa  = 1 * 10⁵ pa

4 )  Area =  1 cm² = (1/100)² meter²

       Force needed = P A  = 20, 000 pa * (1/100²) m²  =  2 Newtons

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Answer 2

Explanation:

p = F/A ( N/ m² )

650pa or N/ m² = F / 15 cm²

650 N/ m² = F / 0.0015m²

F = 650 × 0.0015 N

F = 0.975 N

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