Closed system
A system where energy is conserved
Law of conservation of energy
Energy cannot be created or destroyed, can only be transferred between stores
Specific heat capacity
The amount of energy required to raise the temperature of 1 kg of a substance by 1 degree
Standard units for energy
Joules ( J )
Transfer of energy associated with forces changing the motion of an object
Mechanical transfer
Name the store of energy associated with fuels
Chemical energy store
Define Work done
When energy is transferred from one store to another
What does a triangle mean
Delta
Name the store of energy associated with change in height
Gravitational potential energy store
If a material has a relatively high value for specific heat capacity, state and explain whether it’s relatively hard or easy to heat up
Hard
It required a lot of energy to raise the temperature of 1kg by 1 degree
Name the transfer of energy associated with wave s
Radiation transfer
Define efficient ( in terms of energy )
Only a small percentage of the input energy is wasted
State how unwanted energy transfers can be reduced
By lubrication or thermal insulation
Name the store of energy associated with extending and compressing objects
The elastic potential energy store
Describe the change in the kinetic energy store as the speed of an object decreases
Decreases
