Pupil/Parent overview

Week beginning: 22/06/2020 This week’s work for SCIENCE is linked to the famous scientist Sir Isaac .

Resources you will need to access from the school website, across the week, are: • The PowerPoint • Colouring pencils & paper/cardboard

By the end of the week, you should be able to: 1. Recall facts about . 2. Construct a Newton Disc. 3. Make observations based on what you see with the colours.

If you complete all of the work to a high standard, you may want to think about this extension: 1. Create another Newton Disc but using a different set of colours. Does the same happen? How about varying your design? Science – Week 11 Sequence Light Step 1: Recap time

Last time in Science we looked at concave and convex lenses, together with refraction. I hope you wowed your friends and family with the refraction experiment!

Before we move on, lets have a quick recap.

True or false?

1. Light travels in wavy lines and it can bend around objects easily. 2. Light has to reflect off an object and into our eyes for us to see it. 3. You can use a mirror to see what you sound like. 4. Shiny objects have a smooth surface so they reflect light well. 5. A periscope just has one mirror in it. 6. When light is blocked by an object, you get a shadow. The shadow will be a different shape to the original object. 7. When the sun is high, objects cast a short shadow. Step 2: Check your answers

True or false? – Answers

1. Light travels in wavy lines and it can bend around objects easily. False - Light travels in straight lines. 2. Light has to reflect off an object and into our eyes for us to see it. True 3. You can use a mirror to see what you sound like. False – a mirror is used to see what you look like not sound like. 4. Shiny objects have a smooth surface and so reflect light well. True – dull things don’t reflect light well. 5. A periscope just has one mirror in it. False – a periscope needs two mirrors. 6. When light is blocked by an object, you get a shadow. The shadow will be a different shape to the original object. False – the shadow will be the same shape as the object that makes the shadow. 7. When the sun is high, objects cast a short shadow. True because it is short when the sun is low.

How did you get on? Great! Ok I forgot a few things! Step 3: New knowledge- read this slide (1642 – 1727) is widely recognised as one of the most influential scientists of all time and as a key figure in the . He is responsible for giving the modern world the information that we use today regarding light and the rainbow. In one of his experiments, he used two prisms to split a ray of white light into its coloured components and then put it back together into a ray of white light again.

A simpler way to show how the different colours come together to make up white light is known as the Newton Disc. The disc can be made by creating a colour wheel and rotating it very fast.

In this week’s science lesson, we are going to show you how to make this.

How to make a Newton Disc You will need

• Paper • Scissors • Pencil • Ruler • Glue or sellotape • Cardboard (you could use a cereal box or something similar) • Colouring pencils – red, orange, yellow, green, blue, indigo and violet. • A disc (CD or DVD – be careful with it) or something to draw a circle around. Step 4: Let’s get making- read these instructions and follow along

How to make your Newton Disc

1. Collect the materials listed on the page before. 2. Place the circle (disc) onto the paper and draw around it. Repeat this with the cardboard and cut them both out.

3. Stick the paper circle on top of the cardboard. 4. Take your pencil and your ruler and divide the circle into seven equal (this doesn’t have to be exact) segments. Challenge – (if you have a protractor at home) Remember – there are 360 degrees in a circle and you need 7 segments. What should each segment measure? You could try and measure this out more precisely if you have a protractor..

5. Colour each segment in in a different colour. You could do it in order of the rainbow colours (ROYGBIV).

6. We now need to make a hole in the middle of the disc. Be careful with this. Carefully poke your pencil through the middle until it goes through the paper and cardboard. Don’t make the hole too big as the disc is going to stay on the pencil. You could put some tape around the top of the pencil to hold the disc in place. Step 5: Observations

Gently spin the disc with your fingers, or place the pencil between your palms and gently spin the disc. What do you notice about the colours?

Now spin it a little faster.

What do you notice?

At first you will see the colours quickly spinning around. As the spinning gets quicker the colours will start to blend together and they will appear white. If you don’t see white, then you need to go faster.

You are trying to spin the disc faster than your eyes can process the colours.

We have made a spectrum of colours. This is why spinning the wheel fast enough blurs all the colours together and it makes them appear white. The light from all of the colours is hitting your eyes at almost the exact same time.

Challenge Try using a different set of colours. Does it still appear white? How about a disc with white spaces between each colour? Or a different design.

This video might help you see what it will look like and explain the reasons why this happens at the end: https://www.youtube.com/watch?v=_z7BDab3N7w Step 6: Recording my observations

Use this template to record your findings:

Before I spun the disc, I predicted this would happen: ______

When I spun the disc, this happened: ______

This happened because: ______

Write a new true or false question about this experiment ‘s findings that could be added to the questions on slide 3: ______