Monday - Science
Light and Shadows
Can you observe how shadows change?
Big Question – Can I change the size of a shadow?
It was a lovely sunny Saturday.
Having done all her home learning and eaten her lunch, Eva decided to sit out and enjoy the sunshine. Having put on SPF50 sun cream, Eva put her deckchair in the sunniest part of the garden, away from the shadows of the oak trees.
Eva had a relaxing time lying on her deck chair and reading her book. Gradually she nodded off to sleep. Suddenly, she woke up feeling a bit chilly. When Eva had fallen asleep, she was in bright sunshine. Now she was in the shadow of the oak trees.
Eva was confused. She hadn’t moved, so why now was she in the shadow?
Light can only travel in a straight line. A shadow is formed when something blocks light.
Look at the shadow that the ball makes. What do you think will happen if the ball is moved closer to the torch? What will happen if the ball is moved further away from the torch?
The closer to the light source an object is, the bigger the shadow will be. This is because the object blocks more of the light.
The further away from the light source an object is, the smaller the shadow will be. This is because the object blocks less of the light.
When the light source moves, the shadow will change. When the light source is directly above the object, the shadow will be directly underneath. When the light source is to one side of the object, the shadow will appear on the opposite side. The shadow will also be longer.
Back to Eva's story
The oak trees in Eva’s garden blocked sunlight and caused a shadow. When Eva sat down in the garden, it was midday so the sun appeared to be directly overhead. This meant the shadow was shorter. As the day went on, the sun appeared to be lower in the sky. This angle meant the oak trees cast a longer shadow.
Can you create a short video explaining how shadows can change using objects and your new knowledge? Send them in to Class Dojo for your teacher to see!
If you don't have access to a camera to create a video, why not create a poster about changing shadows?
Listen to the poem by Robert Louis Stevenson read by Billy Connolly. Can you create your own poem about your shadow? Present it in any way that you like and be creative!