department of mathematics and science grade 3 quarter 2 big idea 10: forms of energy light and its...

Department of Mathematics and Science

Grade 3 Quarter 2

Big Idea 10: Forms of Energy 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.

• 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.


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 ObservationsExploration: Refraction•Video: Refraction•Video: The Visible Spectrum


Supplemental 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


What is light?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.


Where Does Light Come From?

Sources of Light

SunCeiling LightsLight bulbs/lampsFlashlight

Candle flame

Produced By

Nuclear reactionsElectricityElectricityChemical reactions &ElectricityChemical energy


What do we know about the 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.


What else do we know about Light?

• Light bounces off or is reflected from some kinds of opaque objects.

• Light travels in waves.

Angles of Reflection


Compare and Contrast ActivityWrite down your responses in your science notebook.

Cardboard VS A Mirror

• Light doesn’t pass through – opaque• dull• A little roughWhat happens when light strikes it? Cardboard absorbs light.

• Light doesn’t pass through – opaque• shiny• very smoothWhat happens when light

strikes it? A mirror reflects light.


Just Passing Through Activity

Write down your responses in your science notebook.

1.What are objects classified as that let all light pass through? Example: glass window; glass cup transparent 2.What are some other transparent examples?3.What are objects classified as that let some light pass through? Examples: wax paper; stained glass window translucent4. What are some other translucent examples?


Bending Light LabWrite down your responses in your science notebook.

• 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:


How does Light Changes Direction?

Explore the Refraction of Light Virtual TutorialAnswer:Light bends or refracts as it passes from one medium (form of matter: solid, liquid or gas) to another.


What Color is Light?Write down responses in your notebook.

• Problem: What happens when we shine a flashlight on a CD?

• Hypothesis:• Test and Observe: • Conclusion:

• Explain/Extend: How a Prism Works


More on Bending LightExplore the Gr. 3 Quarter 2 Light Color LabEvaluate:Write a conclusion using the CER: Claim Evidence Reasoning Conclusion.Question: What colors make up white light?Claim: Evidence: Reasoning:


Claim Evidence Reasoning CER Sample Answer

Question: What colors make up white light?Claim: White light includes all the colors of the rainbow - ROY G BIV.

Evidence: The rainbow colors observed when the light from the window

or flashlight passed through the bubble. Reasoning: When light passes from the air, a gas, to the bubble, a liquid, it

bends.


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.

department of mathematics and science grade 3 quarter 2 big idea 10: forms of energy light and its...

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