Unit 3F: Light and Shadows

1. Unit 3F: Light and Shadows Light and Shadows T Unit 3F: Light and Shadows

2. Unit 3F: Vocabulary Useful Words Transparent Opaque Shadow Block Direction A material that light can pass through, a good example is glass A material that light cannot pass through, a good example is wood A dark area formed when light is stopped by an opaque object To stop, an opaque object blocks light The way something travels V Unit 3F: Light and Shadows

3. Unit 3F: Shadows Why is a shadow formed? D Unit 3F: Shadows: L.O. 1, 2: N.C. 4.3b

4. Unit 3F: Shadow Investigation Shadow Investigation Investigate the shadow formed on the screen. Can you change it’s size or anything about it? How can you do this? Write down anything you discover. I Unit 3F: Shadow Investigation: L.O. 1, 2: N.C. 4.3b

5. Unit 3F: Shadows from the sun Shadows from the sun 1. What will the shadow look like at different times of the day? 2. How will you check this? 3. Why does the shadow change as you have described? A Unit 3F: Shadows from the sun: L.O. 3, 4, 5, 6,7, 8, 9: N.C. 4.4b

6. Unit 3F: The sun ‘moving’ across the sky The sun ‘moving’ across the sky D Unit 3F: The sun 'moving' across the sky: L.O. 10, 11: N.C. 4.4b

7. Unit 3F: Shadows Shadows A Unit 3F: Shadows: L.O. 12: N.C. 4.3b

8. Unit 3F: Does the Sun move on the same route everyday? Investigation: Does the Sun move on the same route everyday? This ‘investigation’ will take a number of days to complete. At 9:00 mark on the window the position of the sun. Repeat this at 10:30, 12:00, 13:30 and 15:00. You then need to repeat this process for a total of at least 3 days. Why is it important to view the position of the sun from the same view point every time? What do the results tell you? WARNING: NEVER LOOK DIRECTLY AT THE SUN! I Unit 3F: Does the sun move on the same route every day?: L.O. 13, 14: N.C. 4.4b

9. Unit 3F: Shadow Sizes Investigation: Shadow Sizes This ‘investigation’ will require you to take a number of measurements at different times of the day. Is the sun at the same height in the sky all day? When is it highest? Does the position of the sun have any effect on the size of the shadows it produces? Use a shadow stick to measure the size of the shadow the sun produces at 9:00, 10:30, 12:00, 13:30 and 15:00 What do the results show? Do we need to repeat our measurements? I Unit 3F: Shadow Sizes: L.O. 15: N.C. 4.4b

10. Unit 3F: The spinning earth The Spinning Earth D Unit 3F: The Spinning Earth: L.O. 16: N.C. 4.4b, 4.4c

11. Unit 3F: Shadow Clocks Shadow Clocks How can the sun dial be used to tell the time? How does it work? What are the disadvantages of using a sun dial in our climate? D Unit 3F: Shadow Clocks: L.O. 17: N.C. 4.4b

12. Unit 3F: Transparent and Opaque Transparent and Opaque TRANSPARENT objects allow light to travel through OPAQUE objects do not allow light to travel through D Unit 3F: Transparent and opaque: L.O. 18: N.C. 4.3b

13. Unit 3F: Shadows from different materials Shadows from different materials For each of the materials predict whether you think they will form a shadow or not. Test each material and record your observations. A Unit 3F: Shadows from different materials: L.O. 19, 20, 21: N.C. 4.3b

14. Block light Formed when light is blocked Similar in shape to object Shadows Opaque Length Change over a day when sun forms them Form Shadows Light and shadows Position Materials Appears to move across the sky Lets light through Shortest shadow Highest in sky at midday Transparent Sun Does not move but earth spins Translucent Some light gets through Shadow formed by sun Can tell approx time Unit 3F: S Unit 3F: Light and Shadows