Lab: Water Drops on a Coin

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					        Lab:     Water Drops on a Coin

Look over the following guidelines and come up with a
lab write-up of your own. You may use the lab report
template to put your report together.

Question: How many drops of water will fit on each coin
          before the water rolls off

Hypothesis:
         If I put __ drops of water on a quarter, __
         drops of water on a penny, __ drops of water
         on a nickel, and __ drops of water on a dime,
         then the water will roll off the edge.

Materials:     List all necessary materials

Procedure:    Read over the procedure. Then use your
         own words to create numbered steps to follow.

          1. Use an eye dropper to drop water onto a
          coin until the water rolls off of the edge.
          2. Record the exact number of water drops
          that are required to cause the water to roll
          off of the coin.
          3. Repeat the experiment three times for each
          coin.
          4. Then average your results (add up the
          three trials for each coin and divide by
          three).

Data:     Set up a table like this in your report.
          Record your results here.

   Coin      Trial 1     Trial 2    Trial 3    Average
Quarter
Dime
Nickel
Penny
Graph:   You also need to make a bar graph for the
         average number of drops for each coin. Coins
         should go on the x-axis and number of drops
         should go on the y-axis.

Conclusions:
         1. How many drops did it take until the water
         rolled off of each coin?
         2. Were your predictions close to your
         results?
         3. Explain why they were or weren't close
         4. Name 2 sources of error

				
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posted:6/26/2012
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