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Welcome to TicTac Town. TIC TAC LESSON Heat and Light. Second Grade. Heat and Light. Heat and light are both types of energy . We can see light energy. We feel heat energy. Some light energy comes from the sun. When sunlight strikes the earth, it changes to heat.

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Presentation Transcript
heat and light
Heat and Light
  • Heat and light are both types of energy.
  • We can see light energy.
  • We feel heat energy.
  • Some light energy comes from the sun.
  • When sunlight strikes the earth, it changes to heat.
  • Without the sun the Earth would be cold and dark.
making heat and light
Making Heat and Light
  • The sun is not the only thing that gives us heat and light.
  • Fire also gives us heat and light.
  • Some people use fire for heat, and some people use fire for light.
light without heat
Light Without Heat
  • A few things give off light without giving off heat.
  • A lightning bug is a good example of this.
heat without light
Heat Without Light
  • Some things may not look hot.
  • We cannot see heat.
  • You should not touch things that might be hot.
reflecting light
Reflecting Light
  • Many things do not give off their own light (rocks, trees, water.)
  • We need light to help us see these things.
  • We can see things that do not give off their own light.
  • We can see them because they reflect light.
  • Light bounces off things that reflect light.
good reflectors
Good Reflectors
  • Some things reflect light better than other things.
  • Light colors reflect light better than dark colors.
  • Smooth, shiny things reflect much light. A mirror is smooth and reflects light well.
good reflectors1
Good Reflectors
  • Not all light that shines on objects is reflected.
  • Light passes through some things.
  • Some things let only part of the light pass through.
  • Some things do not let any light pass through.
heat moves
Heat Moves
  • Heat moves through things.
  • We can feel heat from a fire.
  • The heat moves through the air.
  • When food is cooked, heat moves up through the pan to the food.
heat moves1
Heat Moves
  • Sometimes we do not want heat to move through things.
  • Heavy clothing, thermos bottles, and insulation are all examples of things that keep heat from moving.
changing heat energy
Changing Heat Energy
  • Things with lots of heat energy are warm.
  • Rubbing your hands together makes them warmer. You are adding heat energy.
measuring hot and cold
Measuring Hot and Cold
  • We can use a thermometer to measure hot and cold.
using heat
Using Heat
  • We use heat energy to change things. Food changes when we cook it.
  • Heat keeps our homes warm.
  • We use heat to dry our clothes.
using light
Using Light
  • We use light to light our homes.
  • We use it to light our streets also.
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