Density is the mass per unit .......... of an object.

Density is the mass per unit volume of an object.

True or False? A balloon is denser than a small bar of lead, despite occupying a larger volume.

False. The balloon has a lower mass for its volume, so it is less dense than the lead.

Which state of matter is typically the least dense: solids, liquids, or gases?

Gases are typically the least dense state of matter.

Pressure, unlike force, is a .......... quantity, meaning it does not have a specific direction.

Pressure, unlike force, is a scalar quantity, meaning it does not have a specific direction.

For a constant force, how does the area it acts over affect the pressure produced?

A larger area produces a smaller pressure ; a smaller area produces a larger pressure .

True or False? A pressure of 1 N cm -2 is the same size as a pressure of 1 N m -2 .

False. A cm 2 is a much smaller area than a m 2 , so 1 N cm -2 is a much larger pressure than 1 N m -2 .

Define Archimedes' principle .

Archimedes' principle states that an object submerged in a fluid at rest experiences an upward force ( upthrust ) equal to the weight of the fluid displaced by the object.

Under what condition does a submerged object float, rather than sink further?

It floats once the upthrust equals the weight of the object; the object sinks until the weight of fluid displaced equals its own weight.

Since a fluid at rest is in equilibrium, the pressure at any point within it acts in .......... directions.

Since a fluid at rest is in equilibrium, the pressure at any point within it acts in all directions.

True or False? The magnitude of the upthrust on a submerged object depends on the weight of that object.

False. Upthrust depends on the weight of the fluid displaced , not the weight of the object itself.

Why does pressure increase with depth in a fluid?

Because of the increasing weight of fluid above that point.

A LevelPhysicsOCRFlashcards3. Forces & MotionDensity & Pressure

Density & Pressure (OCR A Level Physics): Flashcards

Exam code: H556

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Define density.

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Cards in this collection (18)

Define density.
Density is the mass per unit volume of an object:
$ρ = \frac{m}{V}$
What are the units of density if mass is measured in kg and volume in m³?
kg m^-3
What are the units of density if mass is measured in g and volume in cm³?
g cm^-3
Density is the mass per unit .......... of an object.
Density is the mass per unit volume of an object.
True or False?
A balloon is denser than a small bar of lead, despite occupying a larger volume.
False.
The balloon has a lower mass for its volume, so it is less dense than the lead.
Which state of matter is typically the least dense: solids, liquids, or gases?
Gases are typically the least dense state of matter.
Define pressure.
Pressure is the force per unit area:
$p = \frac{F}{A}$
Pressure, unlike force, is a .......... quantity, meaning it does not have a specific direction.
Pressure, unlike force, is a scalar quantity, meaning it does not have a specific direction.
For a constant force, how does the area it acts over affect the pressure produced?
A larger area produces a smaller pressure; a smaller area produces a larger pressure.
What is 1 pascal (Pa) equivalent to?
1 Pa = 1 N m^-2
True or False?
A pressure of 1 N cm^-2 is the same size as a pressure of 1 N m^-2.
False.
A cm² is a much smaller area than a m², so 1 N cm^-2 is a much larger pressure than 1 N m^-2.
Define Archimedes' principle.
Archimedes' principle states that an object submerged in a fluid at rest experiences an upward force (upthrust) equal to the weight of the fluid displaced by the object.
Under what condition does a submerged object float, rather than sink further?
It floats once the upthrust equals the weight of the object; the object sinks until the weight of fluid displaced equals its own weight.
What equation gives the change in pressure, Δp, through a depth Δh of fluid?
$Δ p = ρ Δ h g$
Since a fluid at rest is in equilibrium, the pressure at any point within it acts in .......... directions.
Since a fluid at rest is in equilibrium, the pressure at any point within it acts in all directions.
How can the upthrust force on a submerged object be calculated in terms of the fluid's density, ρ, and the volume displaced, V?
$F = ρ V g$
since m = ρV, and upthrust = weight of fluid displaced = mg.
True or False?
The magnitude of the upthrust on a submerged object depends on the weight of that object.
False.
Upthrust depends on the weight of the fluid displaced, not the weight of the object itself.
Why does pressure increase with depth in a fluid?
Because of the increasing weight of fluid above that point.

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