20. Forces & Energy: Energy Transfers and Systems Flashcards
What are the 8 Energy Stores?
Kinetic
Thermal
Chemical
Gravitational potential
Elastic potential
Electrostatic
Magnetic
Nuclear
What are the 3 ways energy can be transferred between stores?
Transferred by heating
Transferred by forces doing work
Transferred by electrical equipment
What is a System?
A single object or group of objects
What happens when a System changes?
When system changes - energy is transferred either into or away from the system - between different objects in the system or different types of energy stores
When system changes - energy is dissipated - stored in less useful ways
How you define your system changes how describe the energy transfers - a closed system is defined so net change in energy is zero
What is Energy Transfer via Heating?
Transferred by heating - pan of water is the system - energy transferred into the system by heating to the thermal energy stores - increases their temperature - when system is camping stove of the pan - energy transferred from chemical energy of gas to thermal energy stores of the pan and water - increasing temp
What is Energy Transfer via ‘Doing Work’ (Mechanically)?
Transferred by forces doing work - the box is the system as it is lifted of the floor - as box is lifted, work is done against gravity - causes energy transferred to boxes kinetic and gravitational potential energy stores
What is Energy Transfer via Electrical Equipment?
Transferred by electrical equipment - electrical devices work by transferring energy between energy stores
