Energy Flashcards
What is energy?
Energy lets us do things in the world
What can we do with energy
Store it or transfer it
What happens when an object does work
The energy changes. When work is done quickly it’s high power energy and when it is done slowly its low power energy
What is kinetic energy store
Energy in movement
What is gravitational energy store
Energy stored by placing something up high where it can fall
What is elastic energy store
Energy stored in springs
What is thermal energy store
Energy stored as heat
What is chemical energy store
Energy stored in chemicals e.g food or petrol
What is nuclear energy store
Energy stored as atomic nuclei/ nuclear power
What is electrostatic energy store
Energy stored as electric charge build up
What is magnetic energy store
Energy stored by separating magnets
What are the 4 types of energy transfers?
By heating, by radiation( light or sound), electrically, or mechanically (by physically pushing or pulling and applying a force
What is the law of conservation of energy
Energy can’t be created or destroyed but it can only be transferred from one energy store to another
What are the energy changes/ transfers for a rock dropping
Gravitational/potential energy ➡️kinetic energy
What energy store is most appropriate for a banana
Chemical energy store
What energy store is most appropriate for 2 magnets attracting each other
Magnetic
What energy store is most appropriate for 2 electrically charged objects attracting each other
Electrostatic
What is the equation linking energy transferred, force and distance moved
Energy transferred = force x distance
Energy store of dropping and object
Mechanically
Energy store in food
Chemical energy, when u eat food it’s metabolised and transfers the energy in food to different stores in ur body
When is energy transferred
When a force moves an object
How can u transfer something mechanically
When a force makes something move e.g. if an object is being pushed, pulled, stretched or squashed
How can u transfer something electrically
When electric charges move around an electric circuit due to a potential difference
How can u transfer something by light or sound
When light or sound waves carry energy from one place to another
How can u transfer something by heating
When an object is transferred from hotter objects to colder objects
What happens when you drop an object
It moves through a gravitational field: energy transfers from gravitational potential energy store to its kinetic energy store. The force of gravity makes the object move so energy is transferred mechanically
How is energy transferred in food
Food has energy stored in chemical energy stores. When u eat food it is metabolised (changed by chemical processes in ur body), which transfers the energy in the food to different stores in ur body
How is energy transferred by burning fuel
When you burn fuel energy is transferred from the fuels chemical energy store to the thermal energy store of the surroundings by heating
How is energy transferred in electric circuits
When u turn on a battery powered fan u complete an electric circuit. Energy is transferred electrically from the chemical energy store of the battery to the kinetic store of the fan
How is energy transferred in a stretched spring
A stretched spring has energy in its elastic potential energy store. When it is released energy is transferred from the springs elastic potential energy store to its kinetic energy store as it moves back to its original shape. A force is making the spring move, so it is transferred mechanically
When is energy transferred
When force moves an object
Why is energy needed
To supply the force that moves an object
What happens when you push a broom
When u push the broom, the energy is supplied in the person pushing a broom, and is transferred to the things it has swept up
