3fm
DESCRIPTION
jTRANSCRIPT
Unit 3F: Light and Shadows
Unit 3F: Light and Shadows
Unit 3F: Light and Shadows
Unit 3F: Light and Shadows
Light and Shadows
Unit 3F: Light and Shadows
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
Unit 3F: Shadows: L.O. 1, 2: N.C. 4.3b
Unit 3F: Shadows
Why is a shadow formed?
Unit 3F: Shadow Investigation: L.O. 1, 2: N.C. 4.3b
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.
Unit 3F: Shadows from the sun: L.O. 3, 4, 5, 6,7, 8, 9: N.C. 4.4b
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?
Unit 3F: The sun 'moving' across the sky: L.O. 10, 11: N.C. 4.4b
Unit 3F: The sun ‘moving’ across the sky
The sun ‘moving’ across the sky
Unit 3F: Shadows: L.O. 12: N.C. 4.3b
Unit 3F: Shadows
Shadows
Unit 3F: Does the sun move on the same route every day?: L.O. 13, 14: N.C. 4.4b
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!
Unit 3F: Shadow Sizes: L.O. 15: N.C. 4.4b
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?
TimeLength of shadow
9.00
10.30
12.00
13.30
15.00
Unit 3F: The Spinning Earth: L.O. 16: N.C. 4.4b, 4.4c
Unit 3F: The spinning earth
The Spinning Earth
Unit 3F: Shadow Clocks: L.O. 17: N.C. 4.4b
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?
Unit 3F: Transparent and opaque: L.O. 18: N.C. 4.3b
Unit 3F: Transparent and Opaque
Transparent and Opaque
TRANSPARENT objects allow light to travel throughOPAQUE objects do not allow light to travel through
Unit 3F: Shadows from different materials: L.O. 19, 20, 21: N.C. 4.3b
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.
Material Prediction Observation
Acetate sheet
Coloured acetate sheet
Plastic bottle
Fine net
Grease-proof paper
Solid plastic
Unit 3F: Light and Shadows
Light and shadows
Shadows
Sun
Appears to move across the sky
Highest in sky at midday
Shortest shadow
Does not move but earth spins
Shadow formed by sun
Can tell approx time
Length
Position
Change over a
day when sun
forms them
Similar in shape to object
Formed when light is blocked
Materials
Opa
que
Translucent
Transparent
Block light
Form Shadows
Lets light through
Some light gets through
Unit 3F: Shadows from different materials