Department of Mathematics and Science Grade 3 Quarter 2 Big Idea 10: Forms of Energy Light and Its Properties

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

Department of Mathematics and Science Discovery Light Resources Exploration: Light EnergyLight Energy Reading Passage: Seeing in the DarkSeeing in the Dark Video: Light: A Visible Form of EnergyLight: A Visible Form of Energy Exploration: ReflectionReflection Video: Light Reflection: Dependent on SurfaceLight Reflection: Dependent on Surface Video: Light Sources and ObservationsLight Sources and Observations Exploration: RefractionRefraction Video: RefractionRefraction Video: The Visible SpectrumThe Visible Spectrum

Department of Mathematics and Science 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

Department of Mathematics and Science 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.

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

Department of Mathematics and Science 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.

Department of Mathematics and Science 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

Department of Mathematics and Science Compare and Contrast Activity Write down your responses in your science notebook. Cardboard VS A Mirror Light doesn’t pass through – opaque dull A little rough What happens when light strikes it? Cardboard absorbs light. Light doesn’t pass through – opaque shiny very smooth What happens when light strikes it? A mirror reflects light.

Department of Mathematics and Science 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 translucent 4. What are some other translucent examples?

Department of Mathematics and Science Bending Light Lab Write 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:

Department of Mathematics and Science How does Light Changes Direction? Explore the Refraction of Light Virtual Tutorial Answer: Light bends or refracts as it passes from one medium (form of matter: solid, liquid or gas) to another.

Department of Mathematics and Science 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 WorksHow a Prism Works

Department of Mathematics and Science More on Bending Light Explore the Gr. 3 Quarter 2 Light Color Lab Evaluate: Write a conclusion using the CER: Claim Evidence Reasoning Conclusion. Question: What colors make up white light? Claim: Evidence: Reasoning:

Department of Mathematics and Science 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.

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