TOPIC 1//Energy stores/Work done/SHC/Conservation of energy and power/Conduction/Convection Flashcards
what are the 8 types of energy stores
Thermal energy
Kinetic energy
Chemical energy
Nuclear energy
Elastic Potential energy
Gravitational Potential energy
Magnetic energy
Electrostatic energy
what are the 4 ways energy is transferred
Mechanically
Heating
Radiation
Electrically
What is a closed system
When neither matter nor energy can enter or leave
The total net change is 0
Describe energy transferred of boiling water in a kettle
Energy is transferred to the water by heating, into the waters thermal energy store
What is work done
Energy Transferred
What 2 ways can work be done
When current flows
By a force moving an object
Kinetic energy formula
Kinetic energy= 1/2 x Mass x Velocity squared
Gravitational Potential energy formula
Gravitational energy= Mass x Height x Gravitational field strength
Elastic Potential energy
1/2 x Spring Constant x Extension
Formula for Extension
Entended length - Original length
Define Specific Heat Capacity
The amount of enegy needed to raise the temperature of a 1kg substance by 1 degree celcius
Formula for specific heat capacity
change in thermal energy = mass x specific heat capacity x temperature change
How does the way energy is stored change when someone throws a ball upwards
Energy is transferred mechanically from the kinetic energy store of the moving hand to the gravitational potential energy of the ball
What is conservation of energy
Energy cannot be created nor destroyed only transferred
why does not all energy transfer usefully between stores
when energy is transferred between stores, not all energy is transferred usefully. Some energy is dissipated to surroundings
