P=presiunea
F=forta
S=suprafata
P= \frac{F}{S}
In acest caz, forta este egala cu greutatea (notata G)
P= \frac{G}{S}
Fie acceleratia gravitationala g=10 \frac{N}{Kg}
Masa caramizii=1.5Kg
l₁=20cm=0.2m
l₂=10cm=0.1m
l₃=8cm=0.08m
Avem 3 posibilitati (cazurile depinzand de suprafata):
Cazul I - Caramida sta pe l₁ si l₂: P₁= \frac{G}{S₁}= \frac{m*g}{l₁*l₂}= \frac{1.5*10}{0.2*0.1}= \frac{15){0.02}= 750 \frac{N}{m²}
Cazul II - Caramida sta pe l₂ si l₃: P₂= \frac{G}{S₂}= \frac{m*g}{l₂*l₃}= \frac{1.5*10}{0.1*0.08}= \frac{15){0.008}= 1875 \frac{N}{m²}
Cazul III - Caramida sta pe l₁ si l₃: P₃= \frac{G}{S₃}= \frac{m*g}{l₁*l₃}= \frac{1.5*10}{0.2*0.08}= \frac{15){0.016}= 937.5 \frac{N}{m²}
Asta e intreaga rezolvare. Daca nu intelegi ceva, intreaba-ma ;)
