Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics⚡️ > Chapter 11 > Flashcards

Chapter 11 Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

what is pressure?

A

the result of when objects exert force on eachother

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

how to increase pressure? 2

A

decrease SA

increase force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

how to decrease pressure? 2

A

increase SA

decrease force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what are the units for pressure?

A

N/m^2 which is equal to 1 Pascal (Pa)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

equation for pressure?

A

force/area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what happens to the pressure of a liquid as depth increases?

A

it increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what does pressure in a liquid depend on?

A

depth and density

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

where is the force of a liquid exerted?

A

on the surface in contact with the liquid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

why is the pressure of a liquid higher when the density is higher?

A

there are more particles in a given area so there are more particles able to collide with the surface in contact, meaning pressure is higher

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

why is the pressure of a liquid higher with increased depth?

A

there are more particles above that point so there is an increased weight, meaning more pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what is the same in a liquid?

A

the pressure on a straight horizontal line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what does the pressure at the bottom of a column of liquid depend on?

A

the height of the column, gravitational field strength and density

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

how to calculate pressure at a certain depth using the column of water above it

A

pressure = height of column x density x gravitational field strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

unit for pressure of a liquid column

A

Pa (1Pa -= 1N/m^2)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is the earth’s atmosphere?

A

a layer of air around the earth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what pressure does the earth’s atmosphere exert at sea level?

A

100 kPa

17
Q

what is atmospheric pressure caused by?

A

air molecules colliding with surfaces

18
Q

why does the atmospheric pressure decrease with height?

A

the atmosphere gets less dense so there are less air molecules pressing down on that surface
there are fewer air molecules above that point, so less weight = less pressure

19
Q

give two examples where atmospheric pressure is used

A

suction cups

sucking up a straw

20
Q

how does suction work?

A

when you push the cup to the wall, there is no air inside it so no air to push it away from the wall
atmospheric pressure acts on the outside of the cup but not the inside, keeping it up

21
Q

how does sucking up a straw work?

A

when you suck, you pull all the air out of the straw
the atmospheric pressure acts on the water and pushes it up the straw because there is no resistance (you have sucked all the air that would push water out of the straw out)

22
Q

what happens to the atmospheric pressure at high altitude?

A

it decreases

23
Q

atmospheric pressure at sea level

A

100 kPa

24
Q

atmospheric pressure at the top of mount everest

A

30 kPa

25
Q

what is an atmosphere?

A

a thin layer of air surrounding the earth

26
Q

equation for pressure at sea level

A

pressure = height x density x gravitational field strength

27
Q

what is upthrust?

A

the pressure a liquid exerts on an object in it

28
Q

when will an object float?

A

when its weight = upthrust

29
Q

what does whether n object will float or not depend on?

A

density

30
Q

how do submarines use upthrust?

A

tanks filled with water means weight is more than upthrust so they sink
tanks filled with compressed air to rise, meaning the submarine weighs less then upthrust

31
Q

why does an object sink?

A

if it is more dense than water, it means that its weight is more than the volume of liquid displaced. This means the weight of the object is greater than the force of upthrust

32
Q

why does an object float?

A

it is less dense than water
it weight is less than the volume of water it displaces
the weight of the object is less than the force of upthrust

33
Q

what is upthrust?

A

the resultant force of the pressure of the water on the top of an object and the pressure of water on the bottom of an object

34
Q

what is upthrust equal to?

A

the volume of water that is displaced by an object

Physics⚡️ (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions