Pressure in solids
![Picture](/uploads/4/6/8/4/46841279/284508953.jpg?250)
THE FORMULA TO PRESSURE (AND FORCE&AREA) CAN BE PUT INTO A SINGLE TRIANGLE AND EASILY REMEMBERED.
F(FORCE) = A(AREA) X P(PRESSURE)
A(AREA) = F(FORCE)/P(PRESSURE)
P(PRESSURE)= F(FORCE)/A(AREA)
F(FORCE) = A(AREA) X P(PRESSURE)
A(AREA) = F(FORCE)/P(PRESSURE)
P(PRESSURE)= F(FORCE)/A(AREA)
Examples using the triangle
TO FIND THE PRESSURE OF ONE OF YOUR BODY PARTS (YOUR HAND FOR EXAMPLE) FIND YOUR WEIGHT IN NEWTONS BY X 10, THEN DRAW AROUND YOUR HAND ON A PIECE OF SQUARE GRAPH PAPER. 1 SQUARE = 1 CM^2. TO FIND THE PRESSURE, THE FORMULA IS P(PRESSURE)=F(FORCE)/A(AREA) - SO, IF THE WEIGHT IS 39 KG -- 390 N, AND THE AREA OF THE HAND IS 77CM^2, YOU WOULD DO 390X77 WHICH WOULD GIVE YOU 5.6 N/CM^2 AND THAT WOULD BE THE PRESSURE EXERTED BY YOUR HAND.
From this triangle we can say that
1. Smaller area gives larger pressure
2. Bigger area gives smaller pressure
We use this knowledge on daily basis
Here are some examples of small area giving larger pressure:
1. Smaller area gives larger pressure
2. Bigger area gives smaller pressure
We use this knowledge on daily basis
Here are some examples of small area giving larger pressure:
Here are some examples of large area giving small pressure: