Energy Stores And Systems Pg.167 Flashcards
Energy is never _____ ___. It’s just the way that it’s stored that changes.
Used up.
Energy is ________ between energy stores.
Transferred.
Energy is stored in the different ______ stores of an object.
Energy.
What is the kinetic energy store?
Anything moving has energy in its kinetic energy store.
What is a thermal energy store?
All object have energy in this store. The hotter the object, the more energy in the store.
What is a chemical energy store?
Anything that can release energy by a chemical reaction has energy in this store .
What is a gravitational potential energy store?
Any object raised above ground level has energy in this store.
What is an elastic potential energy store?
Anything stretched has energy in this store, like springs and rubber bands.
What is an electrostatic energy store?
E.g. two charges that attract or repel each other have energy in this store.
What is a magnetic energy store?
E.g. two magnets that attract or repel each other have energy in this store.
What is a nuclear energy store?
The nucleus of an atom releases energy from this store in nuclear reactions.
Energy can be transferred in ____ ways.
Four.
Mechanically:
This happens when a force _____ ____ on an object.
For example, a force pushing an object along the floor.
Does work.
Electrically:
This happened when a _____ _____ does work.
For example, when a current flows through a lightbulb.
Moving charge.
By heating:
When energy is transferred from a ______ object to a ______ object.
For example,when a pan of water is heated on a hob.
Hotter.
Colder.
By radiation:
This happened when energy is _________ by e.g. sound or light.
For example, when energy from the sun travels to earth by light.
Transferred.
When a system ______, energy is transferred.
Changes.
A system is just the single object or a group of objects that your interested in.
When a system changes, the way the energy is ________ changes in one of the four ways.
Stored.
Closed systems are systems where no matter (stuff) or energy can enter or leave.
When a closed system changes, there us no net (overall) change in the total ______ of the system.
Energy.
For example:
A cold spoon sealed in a flask of hot soup is a closed system.
Energy is transferred from the thermal energy store of the soup to the thermal energy store of the spoon by heating.
But no energy leaves the system. The total energy ______ ____ _____.
Stays the same.
Name the four ways energy can be transferred between stores.
Mechanically.
Electrically.
By heating.
By radiation.
