Science
- Created by: MeganEL
- Created on: 13-05-19 11:25
Name energy stores
Chemical energy
Kinetic energy
Thermal energy
Strain/elastic potential
Atomic/nuclear
Name chemical energy stores
Food
Fuel
Batteries
What’s kinetic energy
Moving objects
What’s thermal energy
Hot objects
What’s strain/elastic potential
Stretched or squashed objects
Name energy transfers
Electrical
Light
Sound
Thermal
Kinetic
Can energy be destroyed and created
No
How does energy move
It moves by being transferred from one form to another
Efficiency equation
Efficiency =
Useful energy transferred by device
Divide by
Total energy
How is energy stored
Energy is stored due to an objects position in a gravitational field
Which objects have a store of GPE
any object above the surface of the earth
What’s the equation for change inGPE
Change in GPE=
Mass (kg) x GFS (N/kg) x change in vertical height (m)
How is energy stored (kinetic)
Energy is stored in moving objects (kinetic). Kinetic energy is stored in moving objects depends on its speed
Equation for calculating kinetic energy
Kinetic = 1/2 x mass x (speed)2
What is energy measured in
Joules
Work the GPE our - airplane flying at 50 m/ s at 5
900 x 10x 500 = 4500000 joules
How does energy spread out
It is dissipated to the surroundings
Is water a good or bad conductor
Bad
Good insulator are a food or bad conductor (heat)
Good insulators are a poor conductor of heat eg. Air particles are spread out so do not pass energy along
Why are polar bears furry
To keep them warm. They have layers of fur with air trapped between them which act like an insulator
Does a good insulator have a good or bad thermal c
Bad
What is thermal conductivity
A measure of how easily easily energy is transferred through a material by heating
Rate of energy transfer is reduced by ....
Increasing thickness
Decreasing thermal conductivity
Decreasing temperature difference
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