Please enable JavaScript.
Coggle requires JavaScript to display documents.
Physics Topic 1 Energy - Coggle Diagram
Physics Topic 1 Energy
Formulae
Work Done
= Force X Distance Moved
Kinetic Energy
= 0.5 X mass X speed2
Elastic Potential Energy
= 0.5 X spring constant X extension2
Gravitational Potential Energy
= Mass X Gravitational Field Strength X height
Change in thermal energy
= Mass X specific heat capacity X temperature change
Power
= energy transfer/ time
Power
= work done/ time
Efficiency
=Useful power output/ Total power input
Efficiency
= Useful energy output transfer/ Total input energy transfer
Energy Pathways
Mechanical- Force acts open an object
Electric- Electric current flow
Heat- Temperature difference between objects
Radiation- Electromagnetic waves or sound
Energy stores and changes
System
: An object or group of objects that interact together. e.g. kettle boiling water.
Energy stores:
Kinetic, chemical, internal (thermal), gravitational potential, elastic potential, magnetic, electrostatic, nuclear. E.g. energy is gained or lost from the object.
Ways to transfer energy
:Light, sound, electricity, thermal, kinetic are ways to transfer from one store to another store of energy. E.g.electrical energy transfers chemical energy into thermal energy to heat water up.
Specific Heat Capacity
Energy needed to raise 1kg of substance by 1℃.
Depends on: substance, mass of substance, energy inputted.
Specific latent heat
Amount of energy needed to change the state of 1kg without hanging its temperature.
Energy conservation and dissipation
Principle of Conservation of Energy
The amount of energy always stays the same. Energy can not be made or destroyed, only changed from one store to another.
Dissipate
To scatter in all directions or use wastefully. When energy is 'wasted' it dissipates into the surroundings as internal (thermal) energy.
Ways to reduce energy waste
Insulation, streamline design, lubrication of moving parts.
National Grid
Using fuels
Transport
Used by cars, planes and trains. E.g. kerosene, petrol, diesel
Heating
used in buildings. E.g. gas and electricity
Electricity
Used in most devices. E.g. most generated by fossil fuels
Non-renewable and renewable sources
Non-renewable sources
This type of energy source will run out. e.g. fossil fuels (coal, oil, gas)
Renewable
These will never run out as there's an infinite amount. e.g. wind, tidal, solar
