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Form 1 Physics Exam Questions and Answers on Pressure

A block of density 8900kg/ $m^3$ measures 2cm by 5cm by 7cm is placed horizontally on a flat surface. Determine the difference between the maximum and minimum pressure.

(4m 2s)

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Answer Text:
Volume = $2x5x7 =70cm^3$
Mass=8.9g/ $cm^3times70cm^3$ =623g
Weight = $623/1000times10= 6.23N$
Area (minimum)= $2times5=10cm^2$
Area (maximum)= $5times7=35cm^2$
P(max)= $6.23/10$ = 0.623N/ $cm^2$ = 6230N/ $m^2$
P(min)=6.23/35= 0.178N/ $cm^2$ =1780N/ $m^2$
P(difference) = 4450 N/ $m^2$