physics paper one

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what are the seven energy stores? and what do they mean?
kinetic, thermal, chemical, gravitational, elastic, electronic, and magnetic
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what are the four ways energy can be transferred? and what do they mean?
mechanically, radiation, heating and electrically
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whats a closed system?
where no energy can enter of leave
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what happens when a force moves an object?
work is done (energy transfer)
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how to work out the kinetic energy?
0.5 x mass (kg) x speed 2 (m/s)
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what happens when an object speeds up?
energy is transferred to the kinetic energy store
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what happens when an object slows down?
energy is transferred away from the kinetic energy store
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how to work out the gravitational potential energy?
mass x gravitational field strength x height
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where does the energy do when an object is moved above the ground?
gravitational field strength
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what happens when you squeeze or squash an object?
energy is transferred to the elastic potential energy store
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what is the equation for elastic potential energy?
0.5 x spring constant x extension 2
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what happens when something is heated? and what does this cause?
energy is transferred to its thermal energy store. causes it to heat up
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what is specific heat capacity?
the total amount of energy need to raise the temp.
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what is power? ans what is it measured in?
the rate of energy transferred. measured in watts
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how to work out power?
energy transferred % time
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what is friction?
when two objects rub together causing the energy to be doubled
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how can you reduce friction?
lubrication
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what does thermal conductor mean?
measurement of how quickly energy is transferred by conduction
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what are materials called with a low thermal conductivity?
thermal insulators
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how to work efficiency with the useful output of energy transferred??
useful output energy transfer % total energy transfer
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how to work efficiency with out knowing the energy transferred?
useful power output % total power input
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what does non renewable energy sources mean? and what can they be used for?
they are fossil fuels or nuclear meaning that they will run out. transport ( petrol, steam trains) and heating (natural gases are burnt to boil water into radiators, coal for fire)
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what are renewable energy resources? and what can they be used for?
they can be replaced. transport (bio fuels) heating
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what are the three main fossil fuels?
coal, oil and natural gases
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what are the seven renewable energy resources?
the sun (solar), wind, water waves, hydro electricity, bio fuels, tides and geothermal
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what do wind turbines do?
when the wind blows the blades turn and electricity is produced
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what are the pros to wind turbines?
no pollution and no lasting damage to the environment
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what are the cons for wind turbines?
they are not as reliable as when the wind stops no electricity can be made. they are also stopped if the winds are to strong
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what are solar cells?
they generate electricity via the sun
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what are the pros to solar cells?
they create no pollution and in sunny conditions they create a lot of electricity
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what are the cons to solar cells?
they tale a lot of energy to build them and they only work during the day.
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what is geothermal power?
it is uses the energy from hot rocks thermal energy stores under the ground to create electricity
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what are the pros for geothermal power?
very reliable as the rocks are always hot
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what does hydro electric power use?
it involves building a big dam or valley which then gets flooded. water flows through the turbines which creates electricity
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what are the pros to using falling water to create electricity?
it does not cause any pollution when it is running
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what are the cons to using falling water to create electricity?
It causes la big impact on the environment (rotting plants means green house gases are realised)
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what are wave powered turbines?
they are placed around the coast and turned by the waves
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what are the cons to wave powered turbines?
they cause destruction to the sea beds and habitats of animals.
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what are tidal barrages?
they are big dams with turbines in the middle of them. when the tide flows through energy is created
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what are bio fuels made from ans what do the produce when burnt?
plant products and animal dung. Co2
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what are the cons to bio fuels?
large parts of the forest are cleared to make room to grow bio fuels
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what effect does burning coal have on the environment?
they reseal co2 which caused global warming.
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what causes acid rain?
when coal and oil is burnt sulfur dioxide is produced
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cons of coal mining?
messed up the landscape
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cons of oil?
oil spills = BIG environmental issues
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cons of nuclear power?
produces dangerous waste which could lead to radiation
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what effects the use of renewable resources?
money, politics,people and ethics
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Other cards in this set

Card 2

Front

what are the four ways energy can be transferred? and what do they mean?

Back

mechanically, radiation, heating and electrically

Card 3

Front

whats a closed system?

Back

Preview of the front of card 3

Card 4

Front

what happens when a force moves an object?

Back

Preview of the front of card 4

Card 5

Front

how to work out the kinetic energy?

Back

Preview of the front of card 5
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