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Simple mechanical paradox

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This relatively simple demonstration of the mechanical paradox is a great way to get young kids to think about physics principles. I used Polydron Sphera from Polydron to make a cylinder and a bicone (two cones joined together at their bases). The cylinder rolls downhill, but bicone rolls towards the upper end, apparently defying gravity. The “trick” here is that the track gets wider apart towards the upper end and because of its shape the bicone’s centre of mass is actually travelling downhill

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⭕ MATERIALS:⠀
- 10 glasses
- Food colouring
- Paper towels
- Water

⭕ INSTRUCTIONS:⠀
(1) Place five glasses of water and add food colouring
(2) Next to each glass of coloured water place an empty glass⠀
(3) Fold paper towels a few times and tear in the middle to make small rectangles
(4) Place one end of each paper towel rectangles in a glass with coloured water and another end into an empty glass.
(5) Make sure all of the glasses are joined and watch as the water walks from one glass to another and makes a beautiful coloured heart shape.

⭕ SCIENCE EXPLANATION
Have you ever thought about how water travels inside plants from roots all the way to the leaves? It is possible because of a process called capillary action. And this is what we see in this experiment too. Water is travelling through small air gaps inside paper towels that act like tubes connecting our glasses and mixing our colours.
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