6.1.1.1 - Energy Stores and System Flashcards
What is a system?
A system is an object or group of objects.
When there are changes in the way energy is stored?
When a system changes.
Give examples of ways energy is stored when a system changes.
An object projected upwards.
A moving object htting an obstacle.
An object accelerated by a constant force.
A vehicle slowing down.
Bringing water to a boil in an eletric kettle.
Which changes in energy is involved when a system is changed?
Heating.
Work done by forces.
Work done when a current flows.
What does thermal energy means?
It means the energy of an object given its temperature.
What does chemical energy means? Give an example.
It means energy stores within chemical bonds, such as ones between molecules.
What does kinetic energy means?
It means the energy of a moving object.
What does gravitational potential energy means?
It means energy of an object because of its position (height) on the ground.
What does elastic potential energy means?
It means energy stored when an object is stretched or squashed.
What does electrical energy means?
It means energy stored from an electrical current.
What does sound energy means?
It means energy transferred or stores from audio/sound waves.
What does internal (thermal) energy means?
It means the total kinetic and potential energy of the particles in an object.
What does magnetic energy means?
It means energy store from magnetic poles attracting or being pulled apart.
What happens when a system changes?
When a system changes, there is a change in some or all of the energy that is stored.
What does “work” in the scientific term is for?
It is for when energy has been transferred.
Energy can be transferred by which transfers?
Mechanical work
Electrical work
Heating
Radiation
What is mechanical work?
It is a force that moves an object through a distance.
What does electrical work do?
It charges that move due to potential difference.
Why is energy transferred by heating?
It is due to a temperature difference caused electrically or through a chemical reaction.
When energy transferred by radiation? Give an example.
When energy is transferred as a wave, such as infrared rays.
What is an Energy Flow Diagram?
It is a diagram used to represent an energy transfer.
How an Energy Flow Diagram works?
In an Energy Flow Diagram, the boxes represent the ‘Energy Stores’, and the arrows represents ‘Energy Transfers’. It
can be a transfer diagram, or a ‘snakey’ diagram – which better represents a change in energy stores.
Explain the transfer diagram.
In transfer diagrams the boxes show the energy stores and the arrows show the energy transfers.
Explain the sankey diagram.
Sankey diagrams start off as one arrow that splits into two or more points.
