What is the word equation for gravitational potential energy?
Gravitational potential energy= mass x gravitational field strength x height
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What is the symbol equation for gravitation potential energy?
Ep= mgh
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What is the word equation for elastic potential energy?
Ee= 0.5 x spring constant x extension(squared)
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What is the symbol equation for elastic potential energy?
Ee= 0.5ke(squared)
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What is internal energy?
The total kinetic and potential energy of all the particle that makes up a system
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What does doing work do to the energy stored in a system?
It increases it
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How does heating change the energy stored in a system?
It increases the energy of the particles stored within it
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What happens if the energy increases?
Either the temperature will increase or it will produce a change of state
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What does the temperature increase depend on?
The mass of substance heated, what the substance is, the energy input
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What is specific heat capacity?
The amount of energy required to raise the temperature of one kilogram of the substance by 100 degrees
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What is the equation for the change in thermal energy?
Change in thermal energy= mass x specific heat capacity x temperature change
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RP- How do you investigate specific heat capacity?
Measure start temp, switch electric heater on for 5min, measure end temp, measure voltage & current, repeat for different liquids, calculate specific heat capacity, compare results
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RP- What are things to consider for the practical?
Energy could be found using joulemeter, if temperature change is too high, energy loss to the surroundings will affect the results
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RP- What are the hazards in this practical?
Electric heater could be very hot- don't touch it directly. If liquids become hot they could boil and spurt, so safety goggles must be worn and the heater must not be kept on for longer than necessary
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What are the two key points when looking at energy transfer?
Energy can be transferred usefully, stored or dissipated and energy can't be created or destroyed
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What is energy like in a closed system?
The total energy never changes, but it can be transferred from one source to another.
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What is an example of wasted energy?
The sound from your washing machine
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How can you reduce the amount of wasted energy?
Lubricatio
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How can you reduce the amount of wasted energy?
Lubrication (reduces friction), tightening (reduces vibration that gives out sound energy, thermal insulation (reduces heat loss)
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What does renewable mean?
Energy that can be used again
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What does non-renewable mean?
Energy that will eventually run out
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What are the renewable energy sources?
Biofuel, wind, water, geothermal, tidal, solar, water waves
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What are the non-renewable energy sources?
Nuclear fuel, coal, oil, gas
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What is the equation for efficiency?
Useful output energy transfer / total output energy transfer
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Other cards in this set
Card 2
Front
What happens when a system changes?
Back
There will be changes in the way energy is stored
Card 3
Front
What is the word equation for kinetic energy?
Back
Card 4
Front
What is the symbol equation for kinetic energy?
Back
Card 5
Front
What is the word equation for gravitational potential energy?
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