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Grade 3 Quarter 2 Topic VII Light and Its Properties

Grade 3 Quarter 2 Topic VII Light and Its Properties. Big Idea 10: Forms of Energy Light and Its Properties Grade 3 Benchmarks. SC.3.P.10.3 - Demonstrate that light travels in a straight line until it strikes an object or travels from one medium to another.

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Grade 3 Quarter 2 Topic VII Light and Its Properties

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  1. Grade 3 Quarter 2 Topic VIILight and Its Properties

  2. Big Idea 10: Forms of Energy Light and Its Properties Grade 3 Benchmarks • SC.3.P.10.3 - Demonstrate that light travels in a straight line until it strikes an object or travels from one medium to another. • SC.3.P.10.4 - Demonstrate that light can be reflected, refracted, and absorbed. • SC.3.P.11.1 - Investigate, observe, and explain that things that give off light often also give off heat. • SC.3.P.11.2 - Investigate, observe, and explain that heat is produced when one object rubs against another, such as rubbing one's hands together. • SC.3.E.6.1 - Demonstrate that radiant energy from the sun can heat objects and when the sun is not present, heat may be lost.  

  3. Light Resources • AIMS Gr. 3 Physical Science: Energy Match-up p. 151 Light Essentials p. 175 Light Rays Slow Down p. 205 Just Passing Through p. 183

  4. Discovery Light Resources • Exploration: Light Energy • Reading Passage: Seeing in the Dark • Video: Light: A Visible Form of Energy • Exploration: Reflection • Video: Light Reflection: Dependent on Surface • Video: Light Sources and Observations Exploration: Refraction • Video: Refraction • Video: The Visible Spectrum

  5. What is light? • Light is something that allows us to see objects. • Light is a form of energy. • Light is produced by the vibrations of electrically charged particles.

  6. Sources of Light Sun Ceiling Lights Light bulbs/lamps Flashlight Candle flame Produced By Nuclear reactions Electricity Electricity Chemical reactions & Electricity Chemical energy Where Does Light Come From?

  7. Properties of Light • Light travels in a straight path. • Light doesn’t travel through all objects. These are defined as opaque. • Light can be absorbed and changed to heat.

  8. Properties of Light Continued • Light bounces off or is reflected from some kinds of opaque objects. • Light travels in waves. Angles of Reflection

  9. Light doesn’t pass through – opaque dull dark absorbs light Light doesn’t pass through – opaque shiny smooth reflects light Compare and ContrastCardboard VS A Mirror

  10. Properties of Light • Some objects let all light pass through them are known as: transparent • Some objects let some light pass through them are known as: translucent

  11. Bending Light LabWrite down responses on your note page. • Problem: What does light do when it travels from one medium or state of matter (air) through another medium (water)? • Hypothesis: • Test and Observe: Follow steps from the lab sheet. • Conclusion:

  12. Light Changes Direction • Light bends or refracts as it passes from one medium (form of matter: solid, liquid or gas) to another. • Refraction of Light Virtual Tutorial

  13. What Color is Light?Write down responses on your note page. • Problem: What happens when we shine a flashlight on a CD? • Hypothesis: • Test and Observe: • Conclusion:

  14. More on Bending Light White light includes all the colors of the rainbow - ROY G BIV. How a Prism Works

  15. TAG Reflections • Tell a fact you learned about light. • Ask a question about something you don’t understand about light. • Give another idea that was addressed in our study of energy.

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