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Number of Drops on a Five Cent Coin worksheet



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Number of Drops on a Five Cent Coin worksheet

How many drops of plain water do you think you can put on a five cent coin?




How many drops of water+detergent do you think you can put on a five cent coin?


Put the five cent coins on top of some paper towel to mop up any mess. Record the number of drops you can put on the five cent coin before the water spills off the coin. Carefully do this making sure the drop from the eye dropper does not touch the dome of liquid over the coin, a drop should not touch the water on the coin before detaching from the dropper.
Do this three times. Then pick another liquid from milk, lemonade and vegetable oil and fill in the appropriate column. Take an average of the number of drops for the three attempts. Use other groups’ results to fill in the results for the other liquids.


Number of drops

Plain Water

Water + detergent

Milk

Lemonade

Vegetable Oil

Try 1
















Try 2
















Try 3
















Average















Were you surprised at how many drops you could add to the coin?

What do you think will happen if you add a drop of detergent to the coin with the plain water?

Why can the five cent coin hold more drops of some liquids than of others?

Which liquid do you think had the highest surface tension? Why?


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