DEFINITION PRESSURE

DEFINITION PRESSURE

Pressure or in the English language is Pressure is force per unit area of ​​the field is pressed vertically. Voltage unit is N / m² = pascal (Pa). pressure is defined as follows:

P = F / A

Description:
F:  force (N)
A:  Surface Area (m²)
P:  Pressure (N / m² = Pa.)

sample questions
A block of mass 300 kg with a length of 1.5 m, a width of 1 m, and a height of 0.5 m.

Determine the pressure at the base of the beam when the beam is placed on the table at the position as shown in the image above!

discussion:

Area of ​​the base beam are:
A = p x l
A = 1.5 x 1 = 1.5 m2

Forces acting on the table is a style of heavy beams,
F = W = m x g = 300 x 10 = 3000 Newton

pressure
P = F / A = 3000/1, 5 = 2000 Pascal

Hydrostatic pressure is the pressure under water. This pressure is due to the weight of the water that makes the fluid dispense pressure.
Hydrostatic pressure caused by the weight of the liquid, so that:

 

Since w = m.g and m =?. V. =?. H.A, then:

 

Description:
p = hydrostatic pressure (N / m²)
? = Density of liquid (kg / m²)
g = acceleration due to gravity (m / s ²)
h = depth of liquid (m)

Hydrostatic Main Law:
"Hydrostatic pressure at all points in the same horizontal plane in a kind of liquid that is in a state of balance is equal".

sample questions
A pitcher of syrup as deep as 15 cm. Determine the hydrostatic pressure at the bottom of a pot, consider the density of the syrup is equal to the density of water is 1000 kg/m3 and gravity acceleration 10 m/s2

 

discussion:
Hydrostatic Pressure:
P = ρ x g x h
P = 1000 x 10 x 0.15 = 1500 Pascal.