physics
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- Created by: clemirai
- Created on: 22-03-21 20:17
energy stores (8)
Thermal, Kinetic, Gravitational Potential, Elastic potential, Chemical, Magnetic, Electrostatic, Nuclear
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Energy transfers
mechanical, electrical, heat, radiation
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describe a system
A system is a single object or a group of objects that you're interested in- when a system changes, energy is transferred, It can be transferred into or away from the system or between different types of energy stores. Closed systems are systems where nei
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define work done
- energy transferred
-current flows (work is done against resistance in a circuit)
- a force moving an object
-current flows (work is done against resistance in a circuit)
- a force moving an object
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equation of kinetic energy store
Ek = 1/2mv(squared)
energy = 1/2 x mass x speed (m/ssqu)
energy = 1/2 x mass x speed (m/ssqu)
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gravitational potential energy equations
Ep =mph
energy = mass x gavitational field strength x height
energy = mass x gavitational field strength x height
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complete this :
Energy lost from the gpe store =
Energy lost from the gpe store =
= energy gained in the kinetic energy store (considering no air resistance)
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elastic potential equation
Ee = 1/2ke(2)
elastic potential energy = spring constant x extension squared
elastic potential energy = spring constant x extension squared
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Specific heat capacity
More energy needs to be transferred to the thermal energy store of some materials to increase their temperature than others
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specific heat capacity investigation
-a block of material with two holes in it
-Measure mass of block, wrap it in insulating layer
-measure initial temp
-turn on the power
-take readings
-turn off power
-plot a graph
-Measure mass of block, wrap it in insulating layer
-measure initial temp
-turn on the power
-take readings
-turn off power
-plot a graph
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Energy law
Energy can be transferred usefully, stored or disappated but can never be created or destroyed
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what is power
power is the rate of doing work, or the rate of energy transfer
p = e/t OR p = w/t
(power = energy transferred over time) or (power = work done over time)
p = e/t OR p = w/t
(power = energy transferred over time) or (power = work done over time)
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describe conduction
Conduction is the process where vibrating particles transfer energy to neighbouring particles
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Describe Thermas conductivity
How quickly energy is transferred through a material . Materials with a high thermal conductivity transfer energy between their particles quickly
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describe convection
COnvection is where energetic particles move away from hotter to cooler regions
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how does the density change in the process of convection
the colder areas become more dense, and the warmer areas less dense
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how can you reduce unwanted energy transfers
- lubricate surfaces
-insulation
-insulation
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descrive efficiency in terms of equations
-efficiency = useful output energy transfer / total energy transfer
-efficiency = useful power output/total power output
-efficiency = useful power output/total power output
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Is it possible for a device to be 100% efficient?
No, except electric heaters, which are an exception.
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label three non-renewable energy resources
-coal
-oil
-gas
-oil
-gas
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Why are non-renewable energy stores discouraged?
-They will run out one day
-They do damage to the environment
-They do damage to the environment
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Which energy store provides us with most of our energy
non-renewable energy sources
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label the renewable energy resources
-solar
-wind
-waves
-hydro-electricity
-bio-fuel
-tides
-geothermal
-wind
-waves
-hydro-electricity
-bio-fuel
-tides
-geothermal
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benefits of renewable energy sources
-will never run out
-less damaging to the environment
-less damaging to the environment
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name a drawback to renewable energy
-still damaging to the environment
-dont provide much energy
-some are unreliable
-some rely on weather, which cannot be controlled
-dont provide much energy
-some are unreliable
-some rely on weather, which cannot be controlled
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what can energy resources be used for
-transport
-heating
-heating
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drawbacks of wind energy
-relies on wind
-unsightly
-noise pollution
-little energy
-unsightly
-noise pollution
-little energy
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drawbacks of solar energy
-relies on the sun, doesn't work at night
-cant increase the pwoer output
-small scale
-cant increase the pwoer output
-small scale
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goethermal drawbacks
-not many suitable locations for power plants
-expensive
-expensive
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drawbacks of non-renewables
-releases Co2 into the atmosphere
-releases sulphur dioxide which can cause acid rain
-coal mining makes a mess of the landscape
-oil spillages cause serious enevironmental problems
-nuclear waste is dangerous
-risk of catastrophe
-releases sulphur dioxide which can cause acid rain
-coal mining makes a mess of the landscape
-oil spillages cause serious enevironmental problems
-nuclear waste is dangerous
-risk of catastrophe
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What are the trends for energy resources
-the energy use overall has increased
-
-
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Other cards in this set
Card 2
Front
mechanical, electrical, heat, radiation
Back
Energy transfers
Card 3
Front
A system is a single object or a group of objects that you're interested in- when a system changes, energy is transferred, It can be transferred into or away from the system or between different types of energy stores. Closed systems are systems where nei
Back
Card 4
Front
- energy transferred
-current flows (work is done against resistance in a circuit)
- a force moving an object
-current flows (work is done against resistance in a circuit)
- a force moving an object
Back
Card 5
Front
Ek = 1/2mv(squared)
energy = 1/2 x mass x speed (m/ssqu)
energy = 1/2 x mass x speed (m/ssqu)
Back
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