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Questions and Answers
Which of the following statements accurately defines pressure?
Which of the following statements accurately defines pressure?
- Force multiplied by area.
- Force per unit area. (correct)
- Area multiplied by force.
- Area per unit force.
What type of quantity is pressure?
What type of quantity is pressure?
- Tensile.
- Vector.
- Imaginary.
- Scalar. (correct)
The pressure exerted by a force is $P$. If the area on which the force acts is doubled while the force remains constant, what is the new pressure?
The pressure exerted by a force is $P$. If the area on which the force acts is doubled while the force remains constant, what is the new pressure?
- $2P$
- $4P$
- $P/2$ (correct)
- $P/4$
What is the standard unit of pressure?
What is the standard unit of pressure?
How does pressure change with depth in a liquid, assuming constant density and gravitational field strength?
How does pressure change with depth in a liquid, assuming constant density and gravitational field strength?
Given the equation $Δp = ρgΔh$, what does '$ρ$' represent?
Given the equation $Δp = ρgΔh$, what does '$ρ$' represent?
A container is filled with a liquid of density $ρ$. At a certain depth $h$, the pressure is $P$. If the depth is doubled to $2h$, what is the new pressure at this depth?
A container is filled with a liquid of density $ρ$. At a certain depth $h$, the pressure is $P$. If the depth is doubled to $2h$, what is the new pressure at this depth?
A force of 100 N is applied to an area of 2 $m^2$. What is the pressure in Pascals?
A force of 100 N is applied to an area of 2 $m^2$. What is the pressure in Pascals?
A barometer is used to measure:
A barometer is used to measure:
The height of the liquid column in a barometer decreases. Assuming constant liquid density, what could be a reason for this?
The height of the liquid column in a barometer decreases. Assuming constant liquid density, what could be a reason for this?
Two divers are at the same depth, one in freshwater and the other in saltwater. Assuming saltwater is denser than freshwater, which diver experiences greater pressure?
Two divers are at the same depth, one in freshwater and the other in saltwater. Assuming saltwater is denser than freshwater, which diver experiences greater pressure?
Which alteration would increase the accuracy of pressure calculation?
Which alteration would increase the accuracy of pressure calculation?
What is the relationship between force $(F)$ and area $(A)$ to maintain constant pressure?
What is the relationship between force $(F)$ and area $(A)$ to maintain constant pressure?
A sharp knife cuts better than a blunt knife because:
A sharp knife cuts better than a blunt knife because:
In a hydraulic system, force is transmitted through a liquid. Which property of the liquid makes this possible?
In a hydraulic system, force is transmitted through a liquid. Which property of the liquid makes this possible?
A cube of side length $2m$ exerts a pressure of $50 Pa$ on the ground. What is the weight of the cube?
A cube of side length $2m$ exerts a pressure of $50 Pa$ on the ground. What is the weight of the cube?
Why are the rear wheels of a tractor generally made large?
Why are the rear wheels of a tractor generally made large?
The atmospheric pressure at sea level is approximately $101325 Pa$. What force does the atmosphere exert on a window with an area of $2 m^2$?
The atmospheric pressure at sea level is approximately $101325 Pa$. What force does the atmosphere exert on a window with an area of $2 m^2$?
A water tank is filled to a height of 10 meters. If the density of water is $1000 kg/m^3$ and the gravitational field strength is $9.8 m/s^2$, what is the pressure at the bottom of the tank due to the water?
A water tank is filled to a height of 10 meters. If the density of water is $1000 kg/m^3$ and the gravitational field strength is $9.8 m/s^2$, what is the pressure at the bottom of the tank due to the water?
In a mercury barometer, if the atmospheric pressure increases, what happens to the height of the mercury column?
In a mercury barometer, if the atmospheric pressure increases, what happens to the height of the mercury column?
Flashcards
What is Pressure?
What is Pressure?
Force per unit area. Measured in N/m² or Pascals (Pa). A scalar quantity.
How does pressure change with depth in a liquid?
How does pressure change with depth in a liquid?
Pressure increases with depth due to the weight of the liquid above.
How does pressure act at a specific depth in a liquid?
How does pressure act at a specific depth in a liquid?
Pressure acts equally in all directions at the same depth in a liquid.
What is a Barometer?
What is a Barometer?
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What is the formula for pressure due to a liquid column?
What is the formula for pressure due to a liquid column?
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Why are tractor wheels large?
Why are tractor wheels large?
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Why do sharp knives cut easily?
Why do sharp knives cut easily?
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What factors affect liquid pressure?
What factors affect liquid pressure?
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What is liquid pressure?
What is liquid pressure?
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How does liquid pressure act?
How does liquid pressure act?
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What happens when a barometer is moved higher?
What happens when a barometer is moved higher?
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How is pressure created by gasses?
How is pressure created by gasses?
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When will the height of liquid in a U shaped tube not change?
When will the height of liquid in a U shaped tube not change?
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Study Notes
Pressure
- Pressure is defined as force acting perpendicularly per unit area.
- Pressure is calculated as force divided by area:
pressure = force / areawhich is alsoP = F/A - The units for pressure are Newtons per square meter (N/m²) or Pascals (Pa).
- Pressure is a scalar quantity
- Pressure depends on force and area,
P=F/A
Force and Area
- Pressure varies with force and area in everyday examples.
- Pressure at a surface produces a force at right angles to the surface.
- The relationship between Force, Pressure and area is that Pressure is directly proportional to Force for a constant area.
- The relationship between Force, Pressure and area is that Pressure is inversely proportional to area for a constant force
- For constant Area:
P ∝ F - For constant Area, Gradient =
P/F = 1/Area
Liquid Pressure
- Liquid pressure is force exerted by liquid particles due to their weight per unit area.
- Liquid pressure is calculated as
P = ρghwhere:Pis the pressureρis the density of the liquidgis the gravitational field strengthhis the depth of the liquid column.
- Liquid pressure depends on depth and density. In other words,
P ∝ h - Liquid pressure is independent of the area of the container.
- Liquid exerts equal pressure in all directions at the same depth.
- Liquid maintains its level in connecting tubes due to same external atmospheric pressure.
Atmospheric Pressure
- Atmospheric pressure can be determined using the height of a liquid column in a liquid barometer.
- Barometers are devices used to measure atmospheric pressure.
- Principle:
P = ρgh ∝ h - Pressure of fluid depends upon the depth of liquid column of known density.
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