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zPhysics > final > Flashcards

final Flashcards

1
Q

What does the amount of thermal energy stored in something depend on?

A

temp, mass, material it is made from

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2
Q

What is the specific heat capacity?

A

Amount of energy it takes to increase 1kg of substance by 1 degree

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3
Q

What is specific latent heat

A

Energy needed to make 1kg of substance change state

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4
Q

Equation for change in thermal energy

A

mass x specific heat capacity x change in temp

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5
Q

Equation for thermal energy needed to change state

A

mass x specific latent heat

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6
Q

How is temp of gass measured?

A

Average kinetic energy

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7
Q

What is the pressure of a gas due to

A

forces on walls of container

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8
Q

Units for pressure

A

Pascals

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9
Q

What is a pascal

A

1N/m2

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10
Q

What is absolute xero

A

-273

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11
Q

Why is it absolute xer o

A

If you continue lines of all gases they meet at 0273

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12
Q

What are the lines for

A

How pressure changes as temp changes

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13
Q

What is absolute 0 oin kelvin

A

0

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14
Q

Is 1 degree difference same with kelvin and celcius same

A

Yes

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15
Q

How do you convert between the two

A

kelvin is 273 above

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16
Q

What is average kinetic energy of particles in a gas directly proportional to

A

temp

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17
Q

Equation with pressure and volume

A

Start p x start v=end p x end v

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18
Q

How does doing work on gas increase temp

A

particles bounce of bike pump and the average speed of them increases

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19
Q

up

A

lift

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20
Q

down

A

weight

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21
Q

forward

A

thrust

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22
Q

bnackwards

A

drag

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23
Q

What does a perfect triangle mean

A

No resultant force

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24
Q

What is the motor effect?

A

When a force is exerted between a magnetic field and a current-carrying conductor placed in that field

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25
Q

Other way electric can current can be made using a magnet and a conductor on a small scale

A

Moving a coil of wire between magnetic poles

26
Q

First part of how a transformer works

A

An alternating current goes through the primary coil

27
Q

Second part of how a transformer works

A

This induces a changing magnetic field in the core

28
Q

Third part of how a transformer works

A

This changing magnetic field induces an electromagnetic force which produces a current in the secondary coil

29
Q

What does a commutator do

A

Switches connections every half turn

30
Q

First part of microphone working

A

Sound waves cause variations in air pressure

31
Q

Second part of microphone working

A

The pressure variations make a diaphragm vibrate

32
Q

Third part of microphone working

A

The diagram moves a coil of wire back and forth

33
Q

First part of loudspeaker working

A

Varying current flows through a coil in a magnetic field

34
Q

Second part of loudspeaker working

A

This causes a force on the coil which moves back and forth as current varies

35
Q

Third part of loudspeaker working

A

Coil connected to a diagram and the movements of the diaphragm produce sound waves

36
Q

First part of how a step up transformer works

A

Primary coil has fewer turns

37
Q

Second part of step up transformer working

A

An AC current produces a magnetic field in the primary coil

38
Q

Third part of step up transformer working

A

The iron cores magnetic field induces a higher voltage in secondary coil

39
Q

Fourth part of step up transformer working

A

Power is conserved so this produces a lower current

40
Q

First part of an electric motor working

A

A coil of wire carrying a current is placed in a magnetic field

41
Q

Second part of an electric motor working

A

The forces on the two sides perpendicular to the field experiences forces in opposite directions

42
Q

Third part of electric motor working

A

This causes rotational effect

43
Q

Why must the current flowing through the primary coil of a transformer be alternating

A

For current to be induced in the secondary coil, the magnetic field in the core must be continuously changing. For the magnetic field to be changing the current in the primary coil must be alternating

44
Q

What does a generator consist of

A

A coil of wire that is rotated inside a magnetic field

45
Q

What are the ends of the coil connected to in a generator

A

A slip ring

46
Q

How is electrical contact with an external circuit made in a generator

A

carbon brushes that press on the slip rings

47
Q

How is magnetic field made

A

Two opposite permanent magnets on each side

48
Q

What do carbon brushes do in a motor

A

Make electrical contacts between circuit and motor

49
Q

What is in middle of electrical motor

A

Pivot

50
Q

Where does ammeter need to be

A

Part of main circuot

51
Q

Where does voltmeter need to be

A

In parralel across what you are measuring

52
Q

How many results do you need

A

Atleast 6 so you can spot a pattern

53
Q

What is ohms law

A

R=V/I

54
Q

Displacement of iregular solid with measuring cylinder

A

Half fill it
put object in
increase in volume is volume of object

55
Q

How do you measure mass

A

Digital balance

56
Q

Displacement can what is volume of object

A

Volume of water displaced

57
Q

What is first part of final practical

A

Investigate the properties of water by determining the

specific heat capacity of water

58
Q

Second part of final core practical

A

obtaining a temperaturetime graph for melting ice

59
Q

How to set up first part of final practical

A

Get a joule metre connected to a heater in water with a thermometer in the beaker,

60
Q

Equation for specific heat capacity

A

Energy/mass x temperature change

61
Q

Do gasses have a fixed volume

A

No

62
Q

What can liquids do

A

Diffuse

zPhysics (9 decks)

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