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Science 🔬#1

QuestionAnswer
What is heat? It is the transfer of energy from the particles of a warmer object to the particles of a cooler object.
How does a game of billiards help to explain heat? (Add a labeled diagram on the test) The fast moving cue ball collides with with a stationary ball and transfers energy to it. The white cue ball slows down and the stationary ball starts to move.
What is temperature? A measure of the average kinetic energy of the particles of a substance.
What is thermal energy? It is the total kinetic energy of the attraction of all the particles of a meterial.
In what direction does thermal energy flow naturally? Thermal enery naturally moves from a substance with a higher temperature to a substance with a lower temperature.
What is conduction and how is it caused? Conduction is the transfer if thermal energy through a substance or between substances in contact. Conduction is caused by the collision of particles.
How does conduction cause an egg to cook in a fry pan? 1.Energy of the burner travels through the pan and into the egg. 2.The particles of the pan collide with the particles of the egg, causing the eggs particles to move faster. 3. This faster motion causes the temperature of the egg to rise.
What natural processes are affected by conduction? Thermal energy form deep within the earth is conducted through matter in the upper layers. This energy is called geothermal energy. It helps form rocks and minerals. Thus, the formation of igneous and metamorphic rock and diamonds results from conduction.
What is convection? Convection is the transfer of thermal energy from one part of a fluid to another by a circulating current of faster moving and slower moving particles.
Explain how convection causes soup to cook on a stove. Refer to the sheet (too many letters)
What natural processes depend on convection? Wind, thunder storms, and volcanic eruptions of the earths crust
What is radiant energy? Radiant energy is energy that travles in the form of electromagnetic waves through empty space. Examples of these waves include visible light, ultraviolet rays, and infrared rays.
What is radiation? Radiation is the transfer of radiant energy through electromagnetic waves.
Use a diagram to explain how the earth and the earth's atmosphere absorb and reflect the sun's radiant energy. Make a diagram on ipad or find picture and copy and paste or look at the study sheet
What two factors determine whether the sun's radiant energy is reflected or absorbed? The colour and texture of objects.
Do darker or lighter objects absorb radiant energy better? Darker objects.
Why is insulation important? Insulation helps slow energy transfer by limiting conduction, convection, or both.
What is a thermal envelope? Materials that seperate a building from the outside.
What parts of the house are part of the thermal envelope? Walls, roof, insulation, windows, doors, finishes, weather stripping, air/vapour barriers
Why is a thermal envelope important for building designers? Building designers try to stop energy loss through the thermal envelope. So that less energy is lost through conduction, convection, and radiation.
What parts of the house should be insulated to prevent the loss of energy? Basment walls, outside walls, roof.
What do R-values of insulation indicate? R-Values indicate the material's ability to resist heat transfer.
What dose a higher number in the R-value mean? The higher the R-value the better the insulator.
Why is air such a good insulator? Air does not transfer energy as well as other materials, so convection andconduction are slower in air.
Use your knowledge of air and insulation to explain how animals keep warm in the winter. Animals gain fat in the cooler climates to act as their insulation. Also most animals have feathers or fur for their insulation.
Besides reducing energy loss, what are 3 advantages if a green roof? Last a long time, can make the air better to breath, and people can enjoy the green roof.
What is the main purpose of an air to air exchanger? The machine trades air inside with the air outside of a building without losing energy.
Why do builders use special windows containing "low-E" glass? Low-E glass keeps radiant energy inside in the winter and outside in the summer.
Draw and lable a diagram to explain how changes of state involve changes in thermal energy. Study the image.
Created by: Kylie_d135