Energy stores and systems Flashcards
Name the 8 energy stores
Gravitational potential
Elastic potential
Electrostatic
Magnetic
Nuclear
Chemical
Thermal
Kinetic
What are the units of energy?
Joules
What is the law of conservation of energy?
Energy cannot be created or destroyed it can only be transferred between stores
Define dissipation
Energy being spread out, usually to the thermal store of the surroundings
What are the 4 energy transfer pathways?
Heating
Electricity
Mechanical (work done by a force)
Waves (light and sound)
What is a system?
An object or group of objects
Describe what is meant by an open system
External forces act
Energy is dissipated
Describe what is meant by a closed system
No external forces act
No energy is dissipated
How many joules are there in 1 KJ?
1,000 J
How many joules are there in 1 MJ?
1,000,000 J
How many watts are there in 1GW?
1,000,000,000 W
State which stores of energy change when a ball is thrown upwards
Gravitational store increases
Kinetic store decreases
Thermal increases
State which stores of energy chnage when a piece of coal is burnt
Chemical store decreases
Thermal store increases
State which store of energy change when a car uses its brakes to slow down
Kinetic store decreases
Thermal store of breaks increases
State which stores of energy change when you drop on object that doesnt bounce
Kinetic store decreases
Thermal store of ball and floor increase
