1
A flying soccer ball has ________ energy
kinetic
What is Kinetic Energy
Energy of Motion
In the Sim, if the molecules are yellow, is the temperature hot or cold?
Hot
What is Potential Energy?
Stored Energy/Energy that is waiting
A boulder rolling down the mountain...., that's __________?
Kinetic energy
True or false: Thermal energy is temperature.
False
When molecules are moving slowly, what does that mean about the temperature?
It's cold
True or False: Metal is a good conductor of heat?
True
True or false: Energy cannot be destroyed
True
What holds heat better: Styrofoam or metal? Why?
Styrofoam
It is a better insulator
How do you find the average of something?
Add all the numbers and then divide by how many there are
Which direction does temperature travel?
From hot to cold
What is equilibrium?
a balanced state in which a system is stable, such as when two or more samples are at the same temperature
What is thermal energy?
The total molecules an object has
What would have a higher average temperature a large sample at 31 degrees or a small sample at 39 degrees?
The larger sample
Eric pours some iced tea into a glass. When he puts the iced tea in the glass, the energy of the glass decreases. What must be true of the energy of the iced tea?
Its energy increases while the energy of the glass decreases.
What is thermal energy?
The energy contained within a system that is responsible for its temperature.
Why does the amount of kinetic energy change when more than one sample is combined?
Because the hot transfers to the cold until it evens out to the same temperature
A group of atoms joined together in a particular way
Why do the transfer of energy between two samples stop?
Runs out of energy to transfer/reaches equilibrium
What is the difference between average kinetic energy and total kinetic energy?
Average kinetic energy = Temperature
Total kinetic energy = Thermal energy
What is an insulator?
a substance which does not readily allow the passage of heat or sound.
What is Convection? Think of the Lava Lamp
Heat rises and cold sinks
In some places, hot water from underground can shoot up into the air through a hole in the ground. When this happens, the ground surrounding the water increases in temperature. What happens to the molecules in the ground when the temperature of the ground increases?
The energy of the molecules in the ground increases.
What units did we use to measure heat?
KJ or kilojoules