Water Tension Coin Investigation

Name:

Date:

🔬 Part 1: Making Predictions

1. Before we start, what do you think will happen when we drip water onto a coin?

The water will roll off straight away

The water will stay on the coin in a special shape

The water will disappear

2. How many drops of water do you think will fit on a 10-cent coin? Make your prediction:

I predict _______ drops will fit on the coin.

3. Draw what you think the water will look like on the coin:

4. How many drops actually fit on your coin before the water spilled?

Number of drops: _______

5. Draw what the water actually looked like on your coin:

6. What shape did the water make on the coin?

Flat like a pancake

Round like a dome or bubble

Square

7. Why do you think the water stayed together on the coin instead of falling off?

8. The special way water holds itself together is called water tension. Where else might you see water tension in real life?

Raindrops on leaves

Water bugs walking on pond water

Water droplets on a car window

Bubbles in the bath

9. What was the most interesting thing you noticed during our investigation?

10. If we tried this experiment with a different liquid (like oil or honey), what do you think might happen differently?