Difference between revisions of "Pressure"

Revision as of 13:17, 15 October 2018

Pressure is the force on a surface per unit area.

A large force on a small area causes a large pressure.

A small force on a large area causes a small pressure.

\[P = \tfrac{F}{A}\] Where:

P = Pressure

F = Force

A = Area

A hydraulic press is used to stamp metal. The press provides a force of 1000N over an area of 0.0002m². Calculate the Pressure applied by the press.	A 25000N elephant stands on 4 feet. The area of each foot is 0.01m². Calculate the pressure on one foot.	A person wearing stilettos rests their entire weight of 600N on one heel. The heel has an area of 0.0005m²
F = 1000N A = 0.0002m² \[P = \tfrac{F}{A}\] \[P = \tfrac{1000}{0.0002}\] \[P = 5,000,000Pa\]	F = 25000N Area of 1 foot = 0.01m² Area of 4 feet = 0.04m² \[P = \tfrac{F}{A}\] \[P = \tfrac{25000}{0.04}\] \[P = 625,000Pa\]	F = 600N A = 0.0005m² \[P = \tfrac{F}{A}\] \[P = \tfrac{600}{0.0005}\] \[P = 1,200,000Pa\]

The force responsible for pressure in a fluid is the weight of all the particles above the object.

The pressure in a fluid decreases with height and increases with depth. The deeper into a fluid the greater the pressure.

Since pressure increases with depth then the bottom of an object will experience more pressure than the top of the object. This causes a force called upthrust.

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 :<math>P = 1,200,000Pa</math>
 |}
+===Pressure in a Fluid===
+: The [[force]] responsible for [[pressure]] in a [[fluid]] is the [[weight]] of all the [[particle]]s above the [[object]].
+: The [[pressure]] in a [[fluid]] decreases with height and increases with depth. The deeper into a [[fluid]] the greater the pressure.
+: Since [[pressure]] increases with depth then the bottom of an [[object]] will experience more [[pressure]] than the top of the [[object]]. This causes a [[force]] called [[upthrust]].