Brainscape's Knowledge GenomeTM

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


See full index

BMAT > physics > Flashcards

physics Flashcards

1
Q

how to calculate total resistance in a parallel circuit

A

(R1 x R2) / (R1 + R2)

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

how is distribution of current different in series and parallel circuits

A

in a series it’s the same everywhere and in a parallel it splits

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

how is voltage distributed in a series and parallel circuit

A

series: divided
parallel: same

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

how is resistance calculated in series and parallel circuits

A

series: add them all
parallel: R1 x R2 / R1 + R2

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

what is alpha radiation

A

2 neutrons and 2 protons

+2 charge and very ionising

low penetrating ability- stopped by paper

short distance travelled before stopped by air

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

what is beta radiation

A

an electron

-1 charge (moderately ionising)

medium penetrating ability- stopped by Al foil

medium distance travelled before stopped by air

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

what is gamma radiation

A

EM radiation

0 charge - not ionising

high penetrating ability - stopped by lead/concrete

long distance travelled before stopped by air

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

how can you show something is a permanent magnet

A

demonstrate that it can repel another permanent magnet

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

4 rules for magnetic field lines

A

start on north poles, end on south and form closed loops
can’t start or end in space
can’t cross one another
closer together when field is stronger

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

what is a soft magnetic material

A

easy to magnetise but also lose their magnetism easily eg iron

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

what is a hard magnetic material

A

difficult to magnetise but once they are magnetised they are difficult to demagnetise eg steel

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

why do electromagnets use soft magnets

A

they easily lose and gain magnetism

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

what things can cause a hard magnet to become demagnetised

A

hitting it or heating it

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

what kind of waves are sound waves

A

longitudinal

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

what are longitudinal waves

A

the medium moves parallel to the propagation of the wave

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

what are transverse waves

A

medium moves perpendicular to the propagation of the wave

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

which characteristics of a wave change when it enters water after travelling through air

A

speed and wavelength

18
Q

what is current

A

rate of flow of charge

19
Q

what happens to the electrical power as the electric potetial difference decreases

A

electrical power decreases because:

power = current x potential difference

20
Q

what is sparking

A

when the air between 2 objects becomes ionised by a large voltage and therefore starts conducting

21
Q

how can insulators become electrically charged by friction

A

when 2 insulators move relative to each other, friction between the 2 results in them becoming electrically charged (one positive and one negative)

22
Q

what is a scalar quantity

A

one that has magnitude (size) but not direction

23
Q

what is a vector quantity

A

one that has both magnitude and direction

24
Q

how to calculate acceleration

A

change in velocity / time

25
Q

what is the area under a speed time graph

A

distance

26
Q

what is the area under a velocity time graph

A

change in displacement

27
Q

what is hookes law

A

force = spring constant x extension

28
Q

what is newtons first law

A

a body will remain at rest or in a state of uniform motion in a straight line unless acted on by an external resultant force

29
Q

what is inertia

A

the resistance of any physical object to any change in its velocity

30
Q

what is newtons second law

A

force = mass x acceleration

31
Q

what is newtons third law

A

if body A exerts a force on body B then body B exerts an equal and opposite force of the same type on body A

32
Q

how to calculate momentum

A

mass x velocity

33
Q

what is thermal energy

A

the energy a substance has because of the motions of its microscopic particles

34
Q

what is the difference between conduction and convection

A

in conduction heat is transferred by microscopic motions of individual particles. kinetic energy is passed from one particle to the next. but in convection heat is transferred by macroscopic motion of large numbers of particles- the particles themselves move around and take their kinetic energy with them

35
Q

how to calculate latent heat

A

energy / mass

36
Q

how to calculate frequency

A

1/ period or 1/T

37
Q

how to calculate wave speed

A

distance/time or freq x wavelength

38
Q

examples of transverse waves

A

all electromagnetic waves, waves on a string, seismic s waves

39
Q

examples of longitudinal waves

A

sound, ultrasound, compression waves on a spring, seismic p waves

40
Q

what is the law of reflection

A

incident angle = reflected angle

BMAT (4 decks)

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