Difference between revisions of "Pressure"
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| style="height:20px; width:200px; text-align:center;" |'''A hydraulic press is used to stamp metal. The press provides a force of 1000N over an area of 0.0002m<sup>2</sup>. Calculate the Pressure applied by the press.''' | | style="height:20px; width:200px; text-align:center;" |'''A hydraulic press is used to stamp metal. The press provides a force of 1000N over an area of 0.0002m<sup>2</sup>. Calculate the Pressure applied by the press.''' | ||
| − | | style="height:20px; width:200px; text-align:center;" |'''A 25000[[N]] elephant stands on 4 feet. The area of each | + | | style="height:20px; width:200px; text-align:center;" |'''A 25000[[N]] elephant stands on 4 feet. The area of each foot is 0.01m<sup>2</sup>. Calculate the pressure on one foot.''' |
| style="height:20px; width:200px; text-align:center;" |'''A person wearing stilettos rests their entire weight of 600N on one heel. The heel has an area of 0.0005m<sup>2</sup> | | style="height:20px; width:200px; text-align:center;" |'''A person wearing stilettos rests their entire weight of 600N on one heel. The heel has an area of 0.0005m<sup>2</sup> | ||
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Revision as of 13:04, 15 October 2018
Key Stage 3
Meaning
Pressure is the force on a surface per unit area.
About Pressure
- Pressure is measured in Pascals (Pa).
- A large force on a small area causes a large pressure.
- A small force on a large area causes a small pressure.
Equation
\[P = \tfrac{F}{A}\] Where:
- P = Pressure
- F = Force
- A = Area
Example Calculations
| 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 \[P = \tfrac{F}{A}\] \[P = \tfrac{600}{0.0005}\] \[P = 1,200,000Pa\] |