Energy Flashcards
kinetic energy store?
object is moving
thermal energy store
object is heated. more heat more energy
gravitational potential
mass and inside a gravitational field
chemical energy store
chemical reactions
elastic potential
stretched or compressed
electrostatic
electric charge interacting with electric charge
magnetic
magnet interacting with magnet
kinetic formula
Kinetic Energy (j) = 1/2 x mass (kg) x speed² 9m/s
small mass, slow speed…?
small amount of kinetic energy
big mass, high speed…?
large amount of kinetic energy
Is someone is dropped which store is the energy transferred to from gravitational potential?
Kinetic energy
Gravitational potential energy formula?
Gravitational energy = mass (kg) x field strength (n/m) x height (m)
Elastic potential energy formula?
Elastic energy = 1/2 x spring constant (n/m) x extension (m)
what is spring extension?
the length (m) of how much the spring stretches
which ways can energy transfer?
mechanically, electrically, thermally, radiation
what is power?
how quickly an energy is transferred from one form to another
what is power measured in?
watts
are power and work done the same?
no
formula for power?
power = energy transferred (j) /time (s)
when is energy transferred called work done?
when moving an object over a distance is involved
are energy transferred and work done the same?
yes
what is the conservation of energy?
energy can be transferred usefully, stored or dissipated but never created or destroyed
what does dissipated mean?
when energy is wasted
formula for efficiency?
useful output energy transfer / total input energy transfer x 100
