Energy 1
Energy 2
Energy 3
Energy 4
Energy 5
100
T or F: Particles in a liquid are more freely moving than a solid
True
100
A blimp flying over the Super Bowl has __________ energy
Kinetic & Potential energy
100
In which state(s) of matter could a substance have thermal energy?
Solids, liquids and gases.
100
At what point on the rollercoaster ride do the riders have the least amount of potential energy?
B
100
At what point on the rollercoaster ride do the riders have the greatest amount of potential energy?
C
200
A student has a glass of water and a block of ice. Both the water in the glass and the block of ice are made up of the same number of molecules. The average speed of the molecules of the water is greater than the average speed of the molecules of the block of ice. Which has more thermal energy and why?
The water has more thermal energy because the molecules of the water are moving faster than the molecules of the ice.
200
How is the average speed of the molecules of an object related to the thermal energy of the object?
When the average speed of the molecules increases, the thermal energy of the object increases.
200
At what point in the path of this ball does the ball have the least amount of potential energy?
The ball has the least potential energy during points A and C.
200
At what point in the path of this ball does the ball have the greatest amount of potential energy?
At point B, when it reaches its maximum height
200
Two objects are heated in an experiment. Here is the experiment data: At the end of the experiment, which object will be hotter and why?
Object B will be hotter because it has less mass
300
A student has two balloons filled with helium gas, Balloon 1 and Balloon 2. The balloons have the same number of helium atoms in them. If the thermal energy of the helium in Balloon 1 is increased so that the helium in Balloon 1 has more thermal energy than the helium in Balloon 2, which helium atoms would be moving faster on average?
The helium atoms in Balloon 1 would be moving faster on average.
300
A girl and a boy are playing on a teeter-totter. They both weigh the same. While the boy is down and the girl is up, which child has more gravitational potential energy?
The girl has more gravitational potential energy.
300
A person hangs three pictures on the wall. The pictures all weigh the same. Picture 1 and Picture 2 are at the same height above the floor. Picture 3 is directly below Picture 1. Which pictures have the same amount of gravitational potential energy?
Pictures 1 and 2 have the same amount of gravitational potential energy.
300
If you increase an object’s temperature, what will happen to the object's thermal energy and why?
It will increase because increasing an object’s temperature increases its thermal energy.
300
A boy has two identical cookies except that one cookie is hot, and the other cookie is the same temperature as the air in the room. He places both cookies on a cold plate. Which cookie will transfer more thermal energy to the plate and why?
The hot cookie will transfer more thermal energy because the temperature difference between the hot cookie and the cold plate is bigger than the temperature difference between the cookie at room temperature and the cold plate.
400
A student has two identical glasses of milk except that the temperature of the milk in one glass is 40ºF and the temperature of the milk in the other glass is 80ºF.
The milk at which temperature has more thermal energy?
The milk at 80 degrees F has more thermal energy.
400
A student places two identical toy bears on a shelf near a window. The bears are at the same temperature. Then the student opens the shutters on the window so that the sun shines on one of the bears but not on the other. Which of the following describes the thermal energy of the bears?
The thermal energy of the bear in the sunlight will be greater than the thermal energy of the bear in the shade because more energy was transferred directly from the sun to the bear in the sunlight.
400
A ball is rolling up and over a hill. The ball slows down as it moves from Position 1 to Position 3, and it speeds up as it moves from Position 3 to Position 5. When is the gravitational potential energy of the ball being transformed into motion energy (kinetic energy)?
Only when the ball rolls from Position 3 to Position 5
400
Balloon 1 and Balloon 2 are filled with the same amount of air. The air in Balloon 1 is cooled so that it is at a lower temperature than the air in Balloon 2. The air in which of these balloons has less thermal energy?
The air in Balloon 1 has less thermal energy.
400
A girl is riding her bicycle down a hill without pedaling. She speeds up as she goes down the hill, and the tires get a little warmer. What energy transformations happen while she is going down the hill?
Gravitational potential energy is transformed into motion energy (kinetic energy) and thermal energy.
500
List and describe the three forms of energy transfer.
Conduction: transfer of energy through direct contact.
Convection: Transfer of energy through a fluid (liquid or gas)
Radiation: transfer of energy through waves in air and space
500
Give two examples of conduction.
Answers vary.
Touching a hot stove, heating a pot on the stove, etc.
500
Give two examples of radiation.
Answers may vary.
ex: the sun, holding hands near fire, etc.
500
Give two examples of convection.
Answers may vary.
Ex: hot air rising and cold air sinking, boiling water, etc.
500
A boy holds a book above the floor. He lets go of the book and the book speeds up as it falls to the floor. Which of the following forms of energy are involved in an energy transformation while the book is falling? Explain.
Both gravitational potential energy and motion energy (kinetic energy) are involved. As the book is falling, its gravitational potential energy decreases and its motion energy increases.