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AQA Physics P1 Energy

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AQA Physics P1 Energy


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what are the type of energy stores?

thermal,kinetic,chemical,gravitational potential,elastic potential,and magnetic energy.

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AQA Physics P1 Energy - Details



40 questions
What are the type of energy stores?
Thermal,kinetic,chemical,gravitational potential,elastic potential,and magnetic energy.
What is a system?
A system is an object or a group of objects you are interested in.
What happens when a system changes?
When a system changes energy is transferred
Define work done and how work can be done?
Work done is the same as energy transferred.Work can be done when a current flows or by a force moving an object.
What is kinetic and thermal energy?
Kinetic energy is anything that is moving and thermal energy is how hot the object is.
What is gravitational and elastic potential energy?
Gravitational potential energy is just how high the object is raised above the ground and elastic potential energy is the stretching or squashing of an object.
Give the equation for kinetic energy
Kinetic energy=0.5 x mass x velocity2
Give the equation for elastic potential energy?
Ee =0.5 x spring constant x (extension)2
What is the definition of specific heat capacity?
The amount of energy needed to raise the temperature of 1KG of a substance by 1 degrees celcius.
What is specific heat capacity measured in?
It is measured in J/KG degrees celcius.
What is the principle of conservation of energy?
Energy can be transferred usefully,stored or dissipated, but can never be created or destroyed.
Define dissipated energy?
Dissipated energy is wasted energy because the energy is being stored in a way that is not useful.
Define power?
Power is the rate of energy transferred or the rate of doing work.
What is power measured in?
Power is measured in watts ,W.
Give the 2 equations to power?
Power=energy transferred divide by time or power=work done divide by time
Define renewable and non-renewable energy sources?
Renewable energy sources will never run out.Non-renewable energy sources will run out one day.
Give examples of renewable energy sources?
Solar(sun),wind,water waves,tides,hydro-electricity,bio fuels and geothermal.
Give the affects of renewable energy sources?
The renewable energy sources don't damage the environment but are unreliable because they are dependant on the weather and locations.
Give example of non-renewable energy sources?
Fossil fuels and nuclear fuels. There are 3 types of fossil fuels such as: coal,oil and (natural)gas.
Give the affects of non-renewable energy sources ?
The non-renewable energy sources provide all our energy but also produce green house gases such as CO2 that can cause global warming.
Define conduction and which state it occurs in?
Conduction is the process where vibrating particles transfer energy to neighbouring particles.It occurs in solids only.
Define convection and which states it occurs in?
Convection is where energetic particles move away from hotter to cooler regions.It occurs in liquids and gases only.
Define efficiency?
Efficiency is how less wasted energy is being dissipated.
How can you improve efficiency give 3 ways?
-insulating objects -lubricating them (oil etc) -making them more streamlined
Give the equation linking energy transfer for efficiency?
Efficiency=useful output energy transfer ________________________ total input energy transfer
Give the equation linking power for efficiency?
Efficiency= useful power output _________________ total power input
How can you reduce unwanted energy transfers?
-cavity walls made up of an inner and outer layer with an air gap (conduction). -cavity wall insulation has foam in the air gap (convection). -loft insulations reduce convection currents being created. -double-glazed windows with an air gap(conduction). -draught excluders reduce convection currents.
How are wind turbines less effective?
They destroy the scenery and people living nearby find it hard due to loud noises.
How are solar panels affected?
They don't work in winter and are useless at that time.
How is geothermal power affected?
It is expensive and there are very few volcanic areas to build them in.
How is hydro-electricity a threat to the environment?
It relies on floods and they cause losses of villages and homes so it is unreliable.
How does waves spoil the seabed?
They spoil the seabed because you will need a big amount of waves and that can cause seabeds to damage fast and their habitats.
Give 2 examples of how tides are unreliable?
They prevent free access by boats and spoil the view due to big bridges needed to be built for this type of energy.
What is a lubricant?
A lubricant is a liquid like oil to prevent friction and to let the object flow easily.
How can you insulate?
You can insulate by having thick walls that are made from a material with a low thermal conductivity.
What does it mean by 'more efficient'?
It means that less energy is being dissipated(wasted energy).
Is all energy transferred usefully?
No because some energy has to be dissipated when energy transfer takes place.