Energy – forces doing work Flashcards
Name the 8 energy stores
- Kinetic
- Gravitational
- Elastic
- Electrostatic
- Magnetic
- Chemical
- Nuclear
- Thermal
What is conservation of energy
Energy cannot be created or destroyed but it can be transferred, dissipated or stored in different ways.
What are the 4 energy transfer pathways
- Mechanical
- Electrical
- Heating
- Radiation
What is one way energy stores and transfer can be represented
A flow diagram
What is one way energy transfers can be represented
Sankey diagrams
What is the equation of conservation of energy
Total energy in = useful energy out + wasted energy out
What is a system
An object or group of objects
Define an open system
Allows the exchange of energy and matter to or from its surroundings
Define a closed system
A system that can exchange energy but not matter to or from it’s surroundings
Define an isolated system
Does not allow the transfer of matter or energy to or from its surroundings
Define the term dissipated
Energy being ‘spread out’ to the surroundings
What is work done
Work done = force × distance moved in the direction of the force
What is gravitational potential energy
The energy an object has due to it’s height in a gravitational field
What is kinetic energy
The amount of energy an object has as a result of its mass and speed
What is power
energy transferred per unit time
