Key Concepts
Things are made of ___, or other types of ___ groups.
molecules, atom
When a thing gets colder, its molecules are moving slower and have _____ kinetic energy.
less
What is kinetic energy?
energy that moves
When something gains or loses energy, is the energy lost evenly divided?
true
When something gets hotter, its molecules are moving ____.
faster
When two things are in contact, their molecules ___, and ___ transfers from the faster molecules to the slower molecules.
collide, energy
Does energy transfer from hot to cold or cold to hot?
hot to cold
radiation
When a thing gets colder, its molecules are moving ___.
___ isn't created or destroyed. Therefore, as energy transfers, it ___ in one part of a system while it ____ in the other part.
energy, increases, decreases
What are the three types of heat transfer?
conduction, convection, radiation
Is copper a good conductor?
yes
Temperature is a measure of the _____ speed of the molecules of a thing.
average
The molecules of a system will transfer energy until the system reaches ____, in which all of the molecules are moving at about the same speed.
equilibrium
True or false: hot air sinks, while cool air rises.
false
What happens when molecules collide?
transfers energy from hot to cold
When something gets hotter, its molecules have more ______ energy.
For things at the same temperature, the thing with more molecules has more ____ kinetic energy than the thing with fewer molecules.
total
How to calculate the equilibrium of two objects?
total kinetic energy (thermal energy) divided by the number of molecules
Someone left their cup of tea out on a cold day. What will happen to the tea?
tea will cool down, and transfer energy to the air until it is the same temperature as the air.