Physics 1 Flashcards
(40 cards)
Conservation of energy law
Energy cannot be created or lost
Gravitational potential energy =
Kinetic energy
Wasted energy is dissipated=
To usually thermal energy
Reduce wasted energy =
Lubrication
System
An object or group of objects
Gravitational potential
Energy stored in an object due to its position in a gravitational field
Thermal energy
Energy due to heat
Power
Rate of energy transfer
Efficiency
Useful energy out divided by total energy in
Wasted energy
Energy transferred into a form that is not the desired outcome
Kinetic energy
Energy due to motion
Elastic potential
Energy stored in a stretched out object
Specific heat capacity
The amount of energy required to raise the temperature of 1kg of a substance by 1’c
Name 3 non renewable sources
Coal
Oil
Gas
Burning fossil fuels results in
The emissions of greenhouse gases which contribute to global warming
Non renewable nuclear power
Nucleus power plants do not real ease CO2 but produce radioactive waste which must be contained
Renewable sources
Geothermal energy
Wind energy
Tidal power
Solar power
Wave power
Biofuel
Hydroelectricity
Renewable sources defined
Never run out of energy and less damaging to the environment
Total energy of a closed system
Is the same before and after the energy transfers to other objects within the closed system
Work is done
Whenever a human moves something
What happened when work is done
Energy is transferred from one place to another
The amount of energy transferred is equal
To the amount of energy gained
Work is measured in
(J) joules
Work triangle
Work done
———————:————————
Force applied x distance moved
