Heat transfer2
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Heat transfer2 Presentation Transcript

  • 1. Where does heat come from? Touch each image and discuss.Motion can produce heat. The amount of heat produced dependson the amount of motion.
  • 2. How can motion create heat? Touch each image to view the different energy levels of the molecule.Water is made of molecules. Molecules are always in motion. Theenergy level of the molecules determines the state of matter.
  • 3. What is heat? Touch each image to see how the water molecules react.Heat is a form of energy caused by the internal motion of molecules.The hotter a substance is, the faster the molecules are moving.
  • 4. What is heat transfer? Drag the hand over the ice or pan, observe the heat transfer for each.Heat transfer is when heat energy moves from a warmerobject to a cooler object.
  • 5. What are the three type of heat transfer?Conduction heat transferred by the direct contact of molecules. Convection heat transferred through a liquid or gas by meansof up-and-down. Radiation heat transferred through empty space by invisibleinfrared rays.
  • 6. Conduction Touch the image.Conduction is the transfer of energy through matter bydirect contact of particles.
  • 7. Do some substances conduct heat more rapidly than others? Write your answers and touch the clouds to reveal some examples.Can you think of objects that are used to conduct heat or energy? Copper wire conducts Metal pots and pans energy. conduct heat to cook food.
  • 8. Do some substances conduct heat and energy poorly? Write your answers and touch the clouds to reveal some examples. Can you think of objects that are used to stop the conduction of heat or energy? A winter coat stops energy from A hot pad stops conductionInsulators are substances that do not conduct heat and being conducted out of a body. energy well. from a hot pan to the hand.Cloth, wood, glass, plastic, and rubber conduct energy and heatvery slowly when in contact with vigorously movingparticles of a hot object.
  • 9. Conduction Lab Drag the objects to connect the battery to the light bulb. Find out which items conduct energy.
  • 10. Convection Click on the red molecule to view the 4 stages of convection.Convection is heat that is transferred in liquids or gases by means of up anddown movements of matter. Cycles are created called convection currents.
  • 11. Draw the direction of the heat flow in the air above the land and theocean.During daytime, the temperature of the land is higher thanthe temperature of the ocean.
  • 12. Draw the direction of heat flow in the air above the land and theocean.At night, the temperature of the land islower than the temperature of the ocean.
  • 13. Radiation Touch each image to see examples of heat radiation.Radiation is the heat energy that is transferred through empty spaceby invisible infrared radiation.
  • 14. Review Question Drag the correct answer to match definition. 1) Energy caused by motion of particles in matter. Heat 2) Tiny particles that make up matter. Molecules 3) Movement of heat from a warmer to a cooler object. Heat Transfer Answer Options· Heat Transfer · Molecules · Heat
  • 15. Review Question Drag the correct answer to match definition. 1) Movement of heat by direct contact. Conduction 2) Movement of heat that is transferred through empty space. Radiation 3) Movement of heat in an up and down motion of particles that occurs in liquids and gases. Convection Answer Options· Convection · Conduction · Radiation
  • 16. Review Question Drag the correct answer to match the example. 1) Bacon cooking in a pan. 2) Air above a grassland plain warming up in the sun causing violent updrafts that lead to the formation of a tornado. 3) The warmth of a fireplace heating a person in a room. Answer Options· Conduction · Radiation · Convection 1) Convection 2) Conduction 3) Radiation
  • 17. 1 Why should the handle of a pot be made of wood or plastic rather than metal? A They are good conductors of heat. B They are poor conductors of heat.
  • 18. 2 What happens to molecules as they heat up? A They burn up and stop moving. B They move less vigorously. C They move more vigorously. D No change occurs.
  • 19. 3 Which is moving faster- particles in a gas or a solid? A gas B solid
  • 20. 4 What happens to molecules as they cool down? A They freeze and stop moving. B They move less vigorously. C They move more vigorously. D No change occurs.
  • 21. 5 Cold air is denser than hot air? A True B False
  • 22. 6 What is the correct order of a convection current? A rise, heat up, sink, cool B sink, cool, rise, heat up C heat up, cool, rise, sink D heat up, rise, cool down, sink
  • 23. 7 In which type of heat transfer do particles actually move around? A convection B conduction C radiation