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Physics > Pressure, Density And Force > Flashcards

Pressure, Density And Force Flashcards

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1
Q

What is pressure?

A

Force per unit area (P = F/A)

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2
Q

What are the units for pascals (Pa)

A

N/m^2

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3
Q

Are area and force directly or inversly proportional?

A

Inversly proportional (smaller area = larger force)

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4
Q

What formula would you use for measuring the pressure of the bottom of a tank?

A

P= F/A

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5
Q

What formula would you use to measure the overall liquid pressure of a tank?

A

P=d x h x g

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6
Q

Turn 1g/cm^3 into kg/m^3?

A

1 x 1000 = 1000 kg/m^3

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7
Q

What would you do to calculate total pressure of a substance?

A

Total p = liq pressure (hdg) + atmospheric pressure (1.01 x 10^5 N/m^2)

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7
Q

What would you do to calculate total pressure of a substance?

A

Total p = liq pressure (hdg) + atmospheric pressure (1.01 x 10^5 N/m^2)

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8
Q

Why is the maximum drinking length of a straw 10.1m?

A

When sucking up water in a straw it causes a vaccum aboth the water, hensforth making the pressure pushing the water up a certain amount.

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9
Q

What causes a liquid to go up a straw?

A

The difference in air pressure (atmospheric pressure and pressure in your mouth)

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10
Q

What is a manomiter?

A

It is a pressure difference device?

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11
Q

How do gasses exert pressure?

A

Gasses exert pressure due to collisions of particals against the wall of a container

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12
Q

What is an equation for gas pressure?

A

Pressure = collissions (F)/ volume of tank(A)

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13
Q

What are some factors that affect size of gas pressure?

A

Number of atoms

Temperature of gas

Volume of container

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14
Q

As the temperature rises the pressure rises, why?

A

When the temp rises so does the average kinetic energy of the particals, therefore the collisions/sec happens at a higher rate on the wall of the container. This causes more pressure.

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15
Q

As the volume increases, the pressure decreases, why?

A

When the volume increases the pressure lowers, this is due to the particals colliding with the walls of the container at a lower rate, therefore meaning there is less pressure formed.

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16
Q

What happens to the force when the volume of a container (containing gas) is halved?

A

The force doubles

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17
Q

Two air bubbles are formed in the same body of water. They have two different volumes and pressures but they are both contained in the same body, why is this possible?

A

F1 x V1 = F2 x V2

EG. 300000Pa x 2cm^2 = 100000Pa x 6cm^2

Or volume x pressure = constant

18
Q

What is density?

A

Mass per unit volume

19
Q

What is an equation for density?

A

density (d) = mass (g) / volume (m^3)

20
Q

What is a vernicalliber?

A

A device usedbto measure things by the 100th mm

21
Q

What is a baromiter?

A

An instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude.

22
Q

What can be barometers be used for?

A

Measuring weather and temperature

23
Q

How does a barometer work?

A

A barometer acts like a balance that ‘balances’ the weight of the atmosphere (or air around you) against the weight of a mercury column.
The air pressure pushes up into a vaccume above the mercury.
If the air pressure is high, the mercury will rise. At low air pressure, the mercury goes down.

24
Q

What is a manometer and how does it work?

A

An instrument for measuring the pressure acting on a column of fluid, consisting of a U-shaped tube of liquid in which a difference in the pressures acting in the two arms of the tube causes the liquid to reach different heights in the two arms.

25
Q

What effects do forces have in a body?

A

They may produce a change is shape or change in size

26
Q

What conditions are needed for a body to have no force applied to itself

A

If the body is stationary or moving at a consistent speed

27
Q

What is the equation for hooke’s law?

A

F = k x

F = force (N)

K = konstant (N/cm)

x = extension of spring

x = extension (cm)

28
Q

What is friction

A

The force between two surfaces which impeads motion and and results in heating

29
Q

Air resistance is a form of what?

A

Friction

30
Q

What is the limit of proportionality

A

The proportional limit is the point on a stress-strain curve where the linear, elastic deformation region transitions into a non-linear, plastic deformation region

(line is no longer straight on graph but turns up)

31
Q

What is the equation for force using mass and acceleration?

A

F = ma

Force (N)

Mass (g)

Acceleration (m/s^2)

32
Q

The larger the string konstant, the stiffer the string, true or false?

A

True

33
Q

100g = 1N

A

True

34
Q

What phrase do you use to describe uncertency in an experiment

A

“Within experimental uncertainty”

35
Q

When something is in an equilibrium, are forces closer to the pivot larger or smaller?

A

Larger

36
Q

What is an equation for moment using force and distance

A

M = FD

Moment: Nm

Force: N

Distance: m

37
Q

How do you find the work done of an extention force graph?

A

You calculate the AREA underneath the gradient

38
Q

Force and distance are what kind of proportional (when the moment is fixed)

A

INVERSELY proportional

39
Q

What is the definition of centre of mass?

A

The point of a body where a body’s mass APPEARS to be concentrated eg the ruler

40
Q

What is an equation that relates impulse, change in momentum, force, time, mass and change in velocity

A

I = 🔺P = F x t = m x🔺v

41
Q

What will happen to a body if no force is applied to it?

A

It will either remain stationary or move with a constant speed

42
Q

What is an equation for force, mass, and acceleration?

A

F = ma

Physics (4 decks)

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