YR 8 - Physics [Fuels + Waves] Flashcards
What is an energy store?
An energy store is the energy contained within a system.
What is a system?
A system is the object that is carrying out an energy transfer.
What are the stores of energy?
The stores of energy are: thermal, chemical, elastic, kinetic, and gravitational.
What happens when a device works?
When a device works, energy may be moved from one store to another.
What happens when energy is transferred?
When energy is transferred energy may be wasted if it is transferred to the surroundings.
What happens to wasted energy?
Wasted energy becomes spread out and unable to be used further.
What is a Sankey diagram?
A Sankey diagram is a diagrammatic way to show energy transfer.
What do inefficient devices do?
Devices that waste a lot of energy are said to be inefficient.
What does having a lot of waste energy do?
Having a lot of waste energy increases the cost to run a device.
What is sound?
Sound is a energy transfer.
How does sound travel?
Sound travels as a wave.
Why cant sound travel in a vacuum?
Sound cannot travel in a vacuum as there are no particles to vibrate.
What does increasing the amplitude do?
Increasing the amplitude (height of a wave from the centre) increases volume.
What does increasing the frequency of a sound do?
Increasing the frequency of a sound wave increases the pitch.
When does reflection occur?
Reflection occurs when a wave hits a boundary, the waves bounce off the boundary and are not absorbed.
