physics paper 1 Flashcards
physics
what does conservation of energy mean
ENERGY cannot be created or destroyed
what is energy measured in?
Joules (j)
in an equation what does M mean
Mass
what is a closed system?
a system where no energy is gained or lost from the surroundings
what is kinetic energy equal to
0.5 X mass X speed^2
what is gravitational potential energy equal to
mass X gravitational field strength X height
elastic potential energy equation
0.5 X spring constant X extension^2
the equation for thermal energy
mass X specific heat capacity X change in temp
whats the equation for power
energy transferred / time
whats the unit for power
watts (w) ( joules per second)
whats the equation for efficiency
useful energy out / total energy in
whats the equation for efficiency as a percentage
useful energy out / total energy in X100
whats an example of a finite source
Fossil Fuels - coal, oil/
whats an example of renewable sources
wind power - from wind turbines
what is electricity
the flow of charge
what is current
the rate of flow of charge
what is charge measured in?
coulombs
what is potential difference
how much energy is transferred per coulomb
what is the equation for potential difference
energy transferred / charge
what is the equation for current
charge/time
what is resistance measured on
ohms
are potential difference and current directly proportional?
yes
