Spinning Science: Disappearing colour!

What You Need:

• Paper plate
• Pencil
• Ruler
• Markers, crayons, or tempera paint (purple, blue, green, yellow, orange, red)
• String or yarn

What You Do:

1. Have your child divide the plate into six equal sections using the pencil and ruler. As an added bonus, this step is a useful way to reinforce early fraction skills—in year 2 maths, kids are learning about halves, quarters, and thirds.
2. Next, have him colour each section of the plate a different colour of the rainbow. Make sure he leaves no white showing!
3. Punch two small holes in the centre of the plate, about 1 cm apart. Thread the string or yarn through the holes.
4. Hold one end of the string in each hand so that the colour disk is in the middle. Wind up your disk by turning while you hold the string. One person holding each end of the string works best to keep the disk tight and spinning fast. When the string is wound up tight pull both hands away from each other so that your colored disk spins quickly.
5. When observing the plate, the colour will begin to blur together and eventually appear to disappear or turn white!
6. You can try this activity a second time, dividing the plate in half, and using only two primary colors on your disk. Will the colors disappear again? Find out!

What's Going On?

When you've got the plate spinning, your eye can't separate each colour and identify it. In the whirl, all your eyes can tell you is that they see white! If your child is interested in learning more about "optics," or the study of how we perceive light and colour, encourage your child to do some library investigation to find out about colour and light!

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