P1 conservation and dissipation of energy Flashcards
how can energy be transferred
by heating, waves, electric current, force moves an object
principle of conservation of energy
energy can’t be destroyed or created
what is a closed system
no energy transfers take place out of or into the enrgy stored of the system
what happen in terms of energy within a closed systems
can be transferred between energy stores, total energy always the same
how is work done transferred when it overcomes friction
as energy to the thermal energy of the objects that rub together and to surrounding
what happen when an object is moved upwards
grav pot energy store increases
different types of energy (us. wasted)
useful - in the place we want it in the form we need it
wasted - transferred by undesired pathway
dissipated - has spread to the surroundings
units of weight
newtons
how machines waste energy
friction, air resistance, electrical resistance and noise
what is power
energy transferred per second/ rate which work is done
what happen if an appliance is more powerful
transfers energy at faster rate
what is a system
is an object or group of objects
