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