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25 Cards in this Set
- Front
- Back
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Name 8 Energy Stores |
Chemical Gravitational Potential Elastic Potential Nuclear Thermal Kinetic Electrostatic Magnetic |
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How is energy transferred? |
Heating Mechanically Electrically Radiation |
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What is a system? |
The objects that are moving or changing forces |
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What is a closed system? |
A system where no energy leaves the system |
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What is work done? |
The total amount of energy transferred |
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How do falling objects have any energy? |
Gravitational potential energy is gained when they move higher |
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How is energy converted when a ball drops and bounces? |
Gravitational Potential>kinetic>gravitational Potential |
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What is the formula for kinetic energy? |
Ek =mv^2 2 |
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Formula for gravitational Potential energy? |
Ep = MGH |
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Formula of elastic Potential? |
Ee = ke ^2 2 |
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When is the formula for the elastic Potential not valid? |
When the limit of proportionality is exceeded |
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What is specific heat capacity? |
The amount of energy needed to heat 1kg of a substance by 1 degree |
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What is the formula for specific heat capacity? |
Thermal energy=mass heat capacity temperature change |
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what is power? |
The rate of energy transfer
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What is power measured in?
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Watts
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What does one watt equal?
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One joule per second
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What is the formula for power?
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Power = energy (or work) /time |
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What is conducting?
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The transfer of energy from one particle to another |
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Where does the waste energy go?
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Into the surroundings
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Where does conduction happen?
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Usually in solids (denser materials)
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What is convection?
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The movement of particles from hotter to cooler regions
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The particles move when heated in liquids?
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Because they have become less dense
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How can you reduce unwanted energy transfers?
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Lubricate Insulate |
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How can you improve the efficiency of a house?
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Insulate the windows (double glazing)
Insulate the walls Draft excluders |
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What is efficiency?
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Useful energy/total energy
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