Physics Paper 1 - energy

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What is the equation for kinetic energy?
1/2 x mass x velocity^
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What is the equation for elastic potential energy?
1/2 x spring constant x extension^
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What is the equation for gravitational potential energy?
mass x gravity x height
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What is specific heat capacity?
The energy required to raise the temperature of 1kg of a substance by 1⁰C
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What is the equation linking specific heat capacity and energy?
Energy = mass x SHC x temperature change
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What is power?
The rate at which energy is transferred OR the rate at which work is done
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What is the equation for power?
Power = energy/time OR work done/time
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What is the key rule for energy?
Energy cannot be created or destroyed, only transferred, stored or dissipated
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Name one way of reducing energy waste.
Using oil as lubrication in a motor - reduces friction, so less energy is lost (as heat) through friction
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Name another way of reducing energy waste.
Thermal insulation - double glazing: less useful thermal energy lost
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What is efficiency?
The ratio of the useful work done by the machine (eg) to the energy supplied to it
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What is the equation for efficiency?
efficiency = useful energy output/total energy input OR useful power input/total power output
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How can the efficiency of a system be increased?
Reduce waste output (lubrication, thermal insulation, etc.) and also recycling waste output
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What are the two main non-renewable energy sources?
Nuclear fuel and fossil fuels
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What are the seven main renewable energy sources?
Biofuel, solar, wind, hydro-electricity, geothermal, tidal and water waves
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Why isn't renewable energy the most reliable source?
Wind power is dependent on weather conditions and solar doesn't work during night or bad weather
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Other cards in this set

Card 2

Front

What is the equation for elastic potential energy?

Back

1/2 x spring constant x extension^

Card 3

Front

What is the equation for gravitational potential energy?

Back

Preview of the front of card 3

Card 4

Front

What is specific heat capacity?

Back

Preview of the front of card 4

Card 5

Front

What is the equation linking specific heat capacity and energy?

Back

Preview of the front of card 5
View more cards

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