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Water Tension Coin Investigation
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Water Tension Coin Investigation
You are a water scientist. With an adult, use a clean 10-cent coin, an eye dropper and a small cup of water. Put the coin on a flat tray. Add drops one at a time to the centre, counting carefully. Stop when the water spills. Keep water away from electrical items and wipe up spills.
Before you test
Make a prediction, then try the investigation and record what happens.
1.Before you start, predict what the water will do on the coin. Choose one and explain your idea.
- Spread out flat and run off straight away
- Stay together in a rounded dome for a while
- Disappear into the coin
2.How many drops do you predict will fit on the coin before the water spills? Write a number.
3.Draw what you predict the water will look like on the coin. Show the coin and the water shape.
4.Carry out the test with an adult. Add drops one at a time and count them. How many drops fitted before the water spilled?
5.Draw what the water really looked like just before it spilled. Show how it sat on the coin.
6.What did you notice about the water on the coin? Choose the best match.
- It gathered into a rounded mound
- It made a square shape
- It vanished as soon as it touched the coin
7.Scientists call the way water holds together at its surface surface tension. Which sentence best explains why a mound can form?
- Water particles pull together at the surface
- The coin soaks up all the water
- The water turns into air
8.A tiny water bug can stand on still pond water. How is this like the water on the coin?
9.Look closely at your test. Name one thing you observed, such as the water's shape or what happened just before it spilled.
10.You want to find out whether a different coin holds more drops. What should you keep the same to make it a fair test? Choose two.
- Use the same dropper and add drops in the same way
- Use the same amount of water in the cup
- Change the coin, dropper and way of adding drops each time
11.If you tested oil instead of water, what might you do to find out whether it holds more or fewer drops?
3 printable pages
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