Physics (conservation Of Energy) Flashcards
Kinetic energy-
Anything moving has energy in its kinetic energy store.
Thermal energy-
Any object- the hotter it is, the more energy it has in this store.
Chemical energy-
Anything that can release energy by a chemical reaction, e.g. food, fuels.
Gravitational potential energy-
Anything in a gravitational field (I.e. anything that can fall)
Elastic potential energy-
Anything stretched, like springs, rubber band, etc.
Electrostatic-
E.g two charges that attract or repel each other
Magnetic-
E.g two magnets that attract or repel each other.
Nuclear-
Atomic nuclei release energy from this store in nuclear reactions.
Conservation of energy-
Energy can be stored, transferred between stores, and dissipated- but it can never be created or destroyed. The total energy of a closed system have no net change.
Diddipsted-
Spread out (energy)
How to calculate efficiency-
Efficiency = useful energy transferred by device divided by total energy supplied to device.
Efficiency-
A way of describing how good a machine is at transferring energy into useful forms.
Insulation-
Slows down the rate at which energy is transferred out of a house by heating.
Gravitational potential energy (GPE)-
Energy that is stored because of an objects position in a gravitational field.
Change in gravitational potential energy=
Mass (kg) x gravitational field strength (N/kg) x change in vertical height (m)