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Science - Physics - Energy - P1 Flashcards

1
Q

state the 8 main energy stores

A
  • kinetic
  • magnetic
  • internal (thermal)
  • elastic potential
  • gravitational potentiak
  • nuclear
  • electrostatic
  • chemical
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2
Q

what is a magnetic energy store ?

A

the nergy store when attracting poles are pulled further apart and replling poles are pushed closer together

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3
Q

give examples of a magnetic energy store

A

fridge magnets, compasses, maglev trains which use magnetic levatation

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4
Q

what is an internal (thermal) energy store

A

the totel kinetic and potential energy of the particles in an object, in most cases this is the vibrations - also known as the kinetic energy - of particles. in hotter objects, particles have more kinetic energy and vibrate faster

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5
Q

give an example of an internal (thermal) energy store

A

human bodies, hot coffees, stoves - ice particles vibrate slower but still have energy

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6
Q

what is a chemical energy store ?

A

energy stored in chemical bonds, such as those between molecules

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7
Q

give an example of a chemical energy store

A

foods, muscles, electrical cells

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8
Q

what is a kinetic energy store ?

A

the energy of a moving object

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9
Q

give an example of a kinetic energy store

A

runners, buses, comets

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10
Q

what is an electrostatic energy store ?

A

energy stored when repelling objects have been moved closer together or attracting objects have been pulled further apart

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11
Q

give an exampke of an electrostatic energy store

A

thunderclouds

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12
Q

what is elastic potential energy store ?

A

the energy stored when an object is stretched or squashed

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13
Q

give an example of an elastic energy store

A

compressed springs, inflated ballons

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14
Q

what is gravitational potential energy store ?

A

the energy of an object at height

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15
Q

give an example of a gravitational potential energy stoe

A

kites, aeroplanes

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16
Q

what is a nuclear energy store ?

A

the energy stored in the nucleus of an atom

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17
Q

give an example of a nuclear energy store

A

nuclear reactors

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18
Q

give an example of an energy transfer when bringing water to the boil in a kettle

A

electricity through the kettle increases the internal energy of the element which in turn increases the internal (thermal) energy of the water which increases the temperature of the water

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19
Q

how is energy transferred ?

A

by one of four types of enrgy transfer:
mechanical work
electrical work
heating
radiation

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20
Q

what is mechanical work ?

A

a force moving an object through a distance

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21
Q

what is electrical work ?

A

charges moving due to potential difference

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22
Q

what is heating ?

A

temperature difference caused electrically or by a chemical reaction

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23
Q

what is radiation ?

A

energy tranferred as a wave, eg light and infrared - light radiation and infrared radiation are emitted from the sun

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24
Q

what does dissipated mean ?

A

often referred to as ‘wasted’ energy

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25
in a mechanical system, energy is dissipated when two surfaces rub together. Work is done against friction which causes heating of the two surfaces - so the internal energy of the surfaces increases, what can be done to reduce this ?
adding a lubricant can reduce friction - less heat is wasted
26
how is energy dissipated in a tumble dryer ?
energy is dissipated by sound waves
27
how is energy used usefully in a tumble dryer ?
electical work is transferred into thermal energy, which is used to help dry clothes
28
what is the conservation of energy ?
energy can be transferred, usefully stored or dissipated but it can never be created or destroyed
29
give an example of the conservation of energy in a skydiver
when a skydiver jumps out of a plane, he loses gravitational energy as his height decreases but gains kinetic enrgy as he gains speed
30
how do you calculate kinetic energy ?
kinetic energy = 1/2 X mass X speed squared
31
what is kinetic energy (Ek) measured in ?
joules
32
how do you calculate elastic potential energy ?
1/2 X spring constant X extension squared
33
what is elastic potential energy (Ee) measured in ?
joules
34
how do you calaculate gravitational potential energy ?
mass X gravitational field strenght X strength X height
35
what is gravitational field strength (Ep) measured in ?
joules
36
what is a force ?
a push or pull
37
what is energy ?
the capacity for doing work
38
what is work done ?
the measure of energy transfer when a force moves an object through as distance
39
what does the amount of work done when a force acts on a body depend on ?
- size of force acting on the object - distance throuugh which the force causes the body to move in the direction of the force
40
how do you calculate work done ?
force X distance
41
what is work done measured in ?
joules
42
what is power ?
the amount of energy that is transferred per second
43
how do you calculate power ?
work done / time
44
what is power measured in ?
watts
45
what is efficiency ?
how good a device is at transferring useful energy input into useful enrygy output
46
how do you calaculate efficiency ?
useful energy transferred/ total energy supplied X100
47
can you have an efficiency rate greater than 100% ?
no, as that would mean energy is being created which goes against the law of conservation of energy
48
how is energy useful in an electric kettle ?
energy that heats the water
49
how is energy wasted in an electric kettle ?
thermal energy heating the kettle, infrared radiation lost to surroundings
50
how is energy wasted in an electric kettle ?
thermal energy heating the kettle, infrared radiation lost to surroundings
51
how is energy useful in a light bulb ?
light radiation given out by the hot filament
52
how is energy wasted in a light bulb ?
infrared radiation lost to surroundings
53
name the main energy resources
fossil fuels, nuclear fuel, bio-fuel, wind, hydroelectricity, geothermal, tidal, water waves and the Sun
54
what is an energy resource ?
a useful supply or store of energy
55
where is energy needed ?
homes - cooking public places - hospitals + schools for machinery, heating transport - buses, cars need a fuel source to move
56
how can producing and distributing energy harm the environment?
releasing energy from some stores causes pollution and harmful waste products, burning fossil fuels releases carbon dioxide, adding to the greenhouse effect, and sulphur dioxide which causes acid rain
57
what is renewable energy ?
energy soures that are replenished and not exhausted, eg solar power
58
what does non - renewable mean ?
it will eventually be used up
59
state 2 renewable energy sources
wind, bio-fuel
60
state 2 non-renewable energy sources
nuclear feuls, fossil fuels
61
what are the 3 ways energy is transmitted ?
conduction convection radiation
62
what is a conductor ?
a material that allows thermal energy to be transmitted through it easily
63
what is an insulator ?
a material that does not allow charge or heat to pass through it easily
64
what is thermal conductivity ?
a measure of how wella material conducts energy when it's heated
65
state how to carry out the exeriment to investigate the effectiveness of different materials as thermal insulators
- place a small beaker into a larger beaker. - fill the small beaker with hot water from a kettle. - put a piece of cardboard over the beakers as a lid. The lid should have a hole suitable for a thermometer. -place a thermometer into the smaller beaker through the hole. - record the temperature of the water in the small beaker and start the stopwatch. - record the temperature of the water every 2 minutes for 20 minutes. - repeat steps 1-6, each time packing the space between the large beaker and small beaker with the chosen insulating material. - plot a graph of temperature (y-axis) against time (x-axis).
66
state 2 hazards of the required practicals
- boiling water -scald skin - do not overfill kettle - knocking over beaker - scald skin - place beaker away from the edge of the desk
67
state how to carry out the experiment investigating the effectiveness of different thicknesses of thermal insulators
- wrap a sheet of newspaper around a 100 ml beaker. - fill the beaker with hot water from a kettle. - put a piece of cardboard over the beaker as a lid. The lid should have a hole suitable for a thermometer. - place a thermometer into the beaker through the hole. - record the temperature of the water in the beaker and start the stopwatch. - record the temperature of the water every 2 minutes for 20 minutes. - repeat steps 1-6, each time adding another layer of newspaper around the beaker until there are 10 layers of newspaper wrapped around the beaker. - plot graphs of temperature against time
68
what is temperature ?
a measure of the average kinetic energy of the molecules
69
different materials require different amounts of energy to change temperature, the amount of energy needed depends on what ?
- mass of the material - substance of the material - the desired temperature change
70
what is specific heat capacity ?
the amount of energy needed to raise the temperature of 1kg substance by 1 degrees C
71
how do you calaculate the change in thermal energy ?
mass X specific heat capacity X temperature change
72
explain how to carry out the experiment where you are investigating measuring the specific heat capacity of a material
- place the immersion heater into the central hole at the top of the block. - place the thermometer into the smaller hole and put a couple of drops of oil into the hole to make sure the thermometer is surrounded by hot material. - fully insulate the block by wrapping it loosely with cotton wool. - record the temperature of the block. - connect the heater to the power supply and turn it off after ten minutes. - after ten minutes the temperature will still rise even though the heater has been turned off and then it will begin to cool. Record the highest temperature that it reaches and calculate the temperature rise during the experiment.
73
how do you calaculate energy transferred ?
potential distance X current X time
74
evalute the experiment investigating the specific heat capacity of a material
- not all of the heat from the immersion heater will be heating up the aluminium block, some will be lost to the surroundings - more energy has been transferred than is needed for the block alone as some is transferred to the surroundings,this causes the calculated specific heat capacity to be higher than for 1 kg of aluminium alone
75
state a hazard for investigating the specific heat capacaity of a material
hot immersions heater and a sample material - burnt skin - do not touch when switched on
76
what is conduction ?
the process by which vibrating particles transfer energy to neighbouring particles
77
which state does conduction most commonly occur in ?
solids
78
what is thermal conductivity ?
a measure of how quickly energy is transferred through a material
79
what can materials with high thermal conductivity do ?
transfer energy between their particles quickly
80
what are materials with high thermal conductivity known as ?
thermal conductors
81
what are materials with a low thermal conductivity known as ?
thermal insulators
82
what is convection ?
where energetic particles move away from hotter to cooler regions
83
which state can convection happen in most ?
liquids and gases
84
why does convection happen in liquids or gases ?
their particles are able to move around rather than vibrate in place so the space between individual particles increase causing the density of the region being heated to decrease
85
give examples of thermal insulators in the home ?
cavity walls loft insulation double glazing draught proofing hot water tank jacket thick curtains
86
how do cavity walls work as thermal insulators ?
they are made up of an inner and outer wall with an air gap in the middle the air gap reduces amount of energy transferred by conduction through the walls as air is an insulator
87
how does loft insulation work as a thermal insulator ?
fibreglass (insulating material) wool being laid out across the whole loft reduces conduction to the attic space as the material are insulators
88

gcse science (27 decks)

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