Kinetic Energy
What type of energy is the "energy of movement"?
Kinetic Energy
Does total kinetic energy give us temperature or does average kinetic energy give us temperature?
Average Kinetic Energy!
What is the total amount of kinetic energy in an object called?
Thermal Energy
True or False: Energy is always transferred from the colder object to the hotter object.
False!!!! Energy is always transferred from the hotter object to the colder object.
What happens to molecules when a thing gets hotter?
The molecules speed up! (I will also accept that the amount of kinetic energy increases)
What is transferred when two objects/things collide?
Kinetic Energy
Which of the following samples has a higher temperature?
Sample A: Its thermal energy is 30kj and its average kinetic energy is 5kj.
Sample B: Its thermal energy is 36kj and its average kinetic energy is 3kj.
Sample A since its average kinetic energy is higher.
What is thermal energy(total kinetic energy) based off of?
The size of an object or how many molecules it has.
True or False: Energy can be created, destroyed, or just transfer between objects or things.
FALSE! Energy cannot be created or destroyed! It can ONLY be transferred from one thing to another.
What happens to molecules when a thing gets colder?
The molecules slow down.. (I will also accept that the amount of kinetic energy decreases)
A bathtub filled with water is 45 degrees celsius.
A sink full of water is also 45 degrees celsius.
Which one has a higher average kinetic energy?
What determines how much something will change temperature?
Its size and the amount of molecules in it.
Is equilibrium based off of the average kinetic energy or total kinetic energy?
Average Kinetic Energy!
What is it called when two things end up with the same temperature?
Equilibrium
True or False: Molecules are transferred from one thing to another as temperature changes.
FALSE: Only energy is transferred. 😝
A system starts with 150kj of thermal energy.
The two objects in the system collide which results in energy being transferred.
After reaching equilibrium, the system still has 150kj of thermal energy.
How is it possible for the total amount of thermal energy to be the same if kinetic energy was transferred?
ENERGY IS NOT CREATED OR DESTROYED!!!!!!!
The total amount of thermal energy in a system will not change. The energy is just distributed differently amongst the objects or things that make up the system.
Benjamin put several ice cubes in his glass of water.
The ice started out colder than than the water.
What will happen that can let us know that the two things have reached equilibrium?
The ice will have melted into the water and they will end up being the same temperature.
Which item do you think would have more thermal energy: A bathtub of water or a swimming pool of water?
Swimming Pool
Which way would energy transfer if a heated blanket were set on a person that is cold?
The energy would transfer from the blanket to the person.
Engineers design computers to cool down quickly so they do not break. What happens to the molecules in a computer when the temperature of the computer decreases?
They slow down (or lose kinetic energy)
Sample A is made of 6 molecules. The amount of kinetic energy in each molecule is listed below.
5, 3 ,4, 5, 3, 4
What is the average kinetic energy of Sample A?
The average kinetic energy is 4!
To find this you need to first find the total amount of kinetic energy: 5+3+4+5+3+4= 24
Then divide the total by how many numbers you added up: 24/6= 4
List the three definitions of temperature that we have talked about.
How hot or cold something is.
The average speed of the molecules.
The average kinetic energy of the molecules.
A bathtub filled with water is 45 degrees celsius.
A sink full of water is also 45 degrees celsius.
Which one has more thermal energy?
The bathtub has more thermal energy.
A hot cup of coffee is left in a car in the winter. What will start to happen to the coffee and the air inside the car?
The team with the best answer will get points. No other team will get points from this question.
The molecules of the cup of coffee will start to transfer kinetic energy to the molecules of the air inside the car. The molecules of the cup of coffee will slow down as it transfers its kinetic energy to the molecules of the air. The molecules of the air will start to speed up as they receive kinetic energy. This transfer will continue to happen until the cup of coffee and the air have the same average temperature and have reached equilibrium.
Sample A has molecules that are moving very fast.
Sample B has molecules that are moving very slow.
Which sample is hotter and which sample is colder?
Which sample has a higher average kinetic energy?
Sample A is hotter than sample B. Sample A has the higher average kinetic energy.