p1 - energy Flashcards
8 energy stores
thermal
kinetic
gravitational potential
elastic potential
chemical
magnetic
electrostatic
nuclear
how is energy transferred
mechanically - a force doing work
electrically - moving charges
heating
radiation
what happens when a system changes
energy is transferred, it can be transferred into or away from the system between different objects in the system or between different types of energy stores
what are closed systems
systems where neither matter nor energy can enter or leave. the net change is always 0
when can work be done
when current flows or by a force moving an object
what does movement mean
energy in an object’s kinetic energy store
how is energy transferred to the kinetic energy store
when an object speeds up and is transferred away from this tore when an object slows down
the energy in the kinetic energy store depends on what
the object’s mass and speed
the greater its mass and the faster its going, the more energy there will be in its store.
kinetic energy formula
E = 0.5 x m x v squared
where do raised objects store energy
in gravitational potential energy store
the amount of energy in a g.p.e store depends on what
the object’s mass, height and the strength of the gravitational field the object is in
gravitational potential energy store equation
E = mgh
how do falling objects transfer energy
energy from its gravitational potential energy store is transferred to its kinetic energy store
what happens for a falling object when there is no air resistance
energy lost from the g.p.e store = energy gained in the kinetic energy store
what does air resistance cause energy to do
it causes some energy to be transferred to other energy stores such as thermal energy stores of the object and surroundings
