lesson 7 - models of the sun and shadows
- Review Lesson 6 with the class:
- Describe how the shadows changed over time throughout the day.
- What caused these changes?
- Show students the materials for today's activity (flashlight, their drawing from Lesson 6, their graph from Lesson 6, AA battery, clipboard, laptop/iPad, Shadow Data handout). (Borrow flashlights from other teachers so you have one per student.) (The flashlights are kind of cheap - they need to be squeezed around the middle to work.)
- What do you think we'll be doing with these materials today?
- How can we model the positions of the sun throughout the day from our previous lesson?
- How can we explain what causes shadows to change length and position using these materials?
- Clarify what the materials are for...
- What does the flashlight represent?
- What is modeled when we move the flashlight?
- What is modeled when we shine the flashlight on the AA battery?
Directions for today's activity:
- Create a video that shows and explains:
- how the sun appears to moves across the sky each day.
- how the battery shadows were created on our recording sheet in the previous lesson.
- why some shadows are longer than other shadows.
- why the shadows change position over time.
- Be sure to show the path the sun took to make the same shadows as you recorded on your sheet.
- Answer the following questions on video:
- When do long shadows occur? What causes them to be long?
- When do their short shadows occur? What causes them to be short?
- What would cause no shadow to occur? (I can think of at least two reasons. Can you?)
- Sit with your science partner.
- Each of you should open your "Earth in Space" GoogleDoc.
- Go to the bottom of your document. Hit enter twice and type LESSON 7: MODELS OF THE SUN AND SHADOWS
- Hit enter twice and type REFLECTION
- You should then answer the following questions. Be sure to discuss the answers with your partner and then type your answer in your own words.
Today's reflection questions should be answered in the following format:
- Question: (Type the question here)
- Claim: (You need to answer it as best you can here)
- Evidence: (You need to supply as much evidence to support your claim as possible, here)
- How are the paths of the winter sun and summer sun alike?
- How are the paths of the winter sun and summer sun different?
- What causes shadows to get longer and shorter?
- Where is the sun when it casts the longest shadows of the day?
- During which season, and at which time of day, would the sun cast its shortest shadow of the year? Why?