Unit 2 Test Flashcards
What are things made up of?
molecules (or other groups of atoms)
Why did the food coloring move faster in hotter temperature water?
Molecules are moving faster than the food coloring molecules spread out faster.
Absolute zero
0 degrees celcius (32 degrees F)
Temperature is…
the average kinetic energy in the molecules of a thing
formula for average
total KE / total molecule = temp
If something is hot
molecules have more speed/ KE
if something is cold
molecules have less speed/ KE
Why do molecules change speed
the speed up when they get energy from other molecules and slow down when they give energy
if a mug is sitting out what will happen?
the molecules in the cup will transfer energy to the molecules in the air until the reach a stable state or equilibrium
when energy transfers it../
an increase of energy in one part of the system and decrease in energy in the other
when two molecules are in contact…
they collie and kinetic energy transfers from the faster moving molecules to the slower moving molecules
which way does thermal energy transfer
hot—-> cold
energy transfer stops when?
energy transfers when equilibrium is reached
explain newtons cradle
when lifting a sphere on one side of the cradle, letting swing and collie with the stationary soheere it transfer the kinetic energy to the last causing it to swing up and back down transfering energy to the other en again, stops becuase of friction
when two things come in contact…
their molecules collide causing a transfer in kinetic energy from the faster moving molecules to the slower moving molecules
