Show:
Heating Earth
Conduction
Convection
Solar Energy
Variables
100
Uneven heating of Earth by the Sun causes . . .
Wind
100
What is energy transfer by contact called?
conduction
100
What is energy transfer by a (circular) flow of fluid in liquid or gas.
Convection
100
A girl took 2 identical shoe boxes and wrapped one with white pater and the other with black paper. She punched a hole in each box, stuck a thermometer into each hole, and put both boxes in the sunlight. She recorded the temperature every 5 minutes. Which box will heat faster and why?
The black box, because black material absorbs more heat than white material.
100
This variable is what you find out by doing the experiment.
Dependent Variable
200
What is energy transfer by waves or rays called.
Radiation
200
T/F Energy transfer at the point of contact is called convection.
F - It is conduction
200
A wood block floating in a cup of water is evidence that . . a. Solids usually float in water b. The wood block is less dense than the water. c. The wood block weighs less than the water. d. Wood blocs float when they get wet.
B
200
T/F The larger the black area of a solar collector, the more the water will heat up.
T
200
This is anything that can change or vary in an experiment that could affect the outcome.
Variable
300
The major source of energy that heats the Earth is called . . .
the Sun
300
How is hot pizza in your mouth an example of conduction?
When the hot pizza makes contact with your mouth there is an energy transfer by contact.
300
Why does cold water stay at the bottom of a vial filled with room-temp. water? a. Cold water is less dense than room-temp water. b. Water contracts when it cools and becomes more dense. c. Water weighs more when it is cold. d. Water mixes at all temperatures.
B
300
A mother wanted to buy a small wading pool for her two-year old son. She wanted to heat the water in the pool with the Sun's energy. What color should she buy? a. Pink b. green c. white d. black
D. Black - because it will absorb more of the Sun's energy.
300
Factors that don't change during the experiment.
Controlled Variable
400
A girl was at the park on a hot, sunny day. She took her shoes off and ran around on the grass in the sunshine. To get a drink of water, she had to walk on the sidewalk. The sidewalk was so hot that she had to run so her bare feet wouldn't hurt. Whay was the side walk hotter than the grass?
a. The grass is green, and the sidewalk is a lighter color. b. The grass must have been in the shade, and the sidewalk must have been in the sunlight. c. The grass is living, and the sidewalk is not. d. The grass and the sidewalk absorb heat at different rates.
400
A student has a vial of cold water with cold blue water at the bottom. She puts a small bag of warm water next to the vial. What is the name of the current that forms in a vial?
convection current
400
What we know before the experiment starts.
Independent Variable
500
The air gets warm when the Sun shines on Earth. Explain how that happens.
Solar energy radiates to Earth. Energy is transferred to Earth's materials and they begin to heat up. Heat is less dense and begins to rise. This heat transfers energy to air particles. This warms the air.
500
A student carefully squeezes a few drops of very cold water into the bottom of a vial filled with room-temperature water. What happens 5 seconds after the very cold water is placed in the room-temperature water? a. The cold water moves to the middle of the room-temp water. b. The cold water mixes all through the vial. c. The cold water stays in the bottom of the vial. d. The cold water rises to the top of the room-temp water.
C
500
What is the root word of variable and what does it mean?
Vary = change