Studied by 0 people
Looks like no one added any tags here yet for you.
what is the conservation of energy principle?
energy cannot be created or destroyed, only transferred, stored, or dissipated
why is dissipated energy called wasted energy?
it is stored in a way that is not useful, usually in thermal energy stores
why does a phone feel warm after being used for a while?
energy is transferred from the battery's chemical store, but some is dissipated to the phone's thermal energy store
why does soup cool down when a spoon is placed in it inside a sealed flask?
energy is transferred from the soup's thermal store to the spoon's thermal store, but no energy leaves the system, so net change is zero
what is conduction?
the transfer of energy by vibrating particles in solids
how does conduction work?
heated particles vibrate more, colliding with neighboring particles and transferring energy through kinetic stores
what is thermal conductivity?
a measure of how quickly energy is transferred through a material
what is convection?
the movement of energetic particles from hotter to cooler regions in liquids and gases
why does heated fluid become less dense?
particles move faster and spread apart, increasing the space between them
how does a convection current form?
warm, less dense fluid rises, cooler, denser fluid sinks, and the cycle continues if there is a constant heat source
how do radiators heat a room?
warm air rises, cooler air moves in to replace it, creating a convection current
how does lubrication reduce friction?
it reduces friction between surfaces, preventing energy dissipation as heat
what are lubricants usually made of?
liquids like oil that can flow between objects and coat them
how can insulation reduce heat loss in a house?
thick walls with low thermal conductivity slow down energy transfer
how can you investigate thermal insulators?
measure water temperature loss in a sealed container wrapped in different materials
how does insulation thickness affect heat loss?
thicker insulation reduces temperature change, making it a better thermal insulator
Note 
Flashcard (33)