Energy pt2 Flashcards
change in object potential energy store(graviational Joules J) =
Weight(newtons) x Change of height(metres).
change of gravitational potential energy store(Joules J)=
mass(kilograms,kg) x gravitational field strength(newtons per kilogram N/Kg) x Change of height(metres m)
Equation for work done.
Work=force x distance moved
Equation for Gravitational Potential Energy.
Gravitational Potential=mass x gravity x height
To rearrange for mass in the GPE equation.
GPE/gravity x height
To rearrange for height in the GPE equation.
GPE/mass x gravity
Kinetic energy equation.
1/2 x mass(kg) x velocity(squared(m/s)
To rearrange the kinetic energy equation for mass:
m= 2KE
——
V squared
To rearrange the kinetic energy for velocity
v= Square root 2KE/M
What does the spring constant tell you?
The spring constant tells you the stiffness of the spring.The higher the value, the more energy required to extend the spring.
Equation for power
Power= Energy transferred
—————————
time(s)
What is efficiency?
Efficieny is a measure of how much of the total energy is usually transferred.
What is the best emitter of radiation in order from best to worst?
1)matt black surface
2)shiny black surface
3)matt white surface
4)shiny silver surface
What is the best abdorber of radiation from best to worst?
1)Shiny silver surface
2)matt white surface
3)shiny black surface
4)matt black surface.
What is the specific heat capacity ?
The amount of heat required to raise the temperature of 1kg of the substance by 1degrees celsius.
