1. Mrs. Ward Ridge Road Middle School
Drops on a Penny
Mrs. Ward
Ridge Road Middle School

2. Science Starter 09/05 ON PAGE 14-15 OF YOUR SCIENCE NOTEBOOK:
Record the Words across the top Margin of both Pages “Water cohesion Lab: Drops on a penny”
Record the following on the first lines of Page 14:
Ask Questions: How many water droplets will fit on the surface of a penny?
BackGround Research:

3. Announcements 09/05

4. Background Research…What do we know about water?

5. Hypothesis
If I __________________________, then ____________________________ because _______________________________________ ____________________________.

6. INDEPENDENT/DEPENDENT Variables
IVDDV: Independent Variable Determines the Dependent Variable
Independent variable: What you can change
Dependent Variable: What is changed

7. Procedures Put the penny on a flat surface.
Use the eye dropper to drop water on the penny, one drop at a time.
Count the number of drops until the water spills over the edge of the penny.
Record your data.
Repeat steps 1 -4 for a total of 5 trials.

8. Data Chart Number of drops of water held by a penny 1 2 3 4 5 Average
Trial
Number of Drops 1 2 3 4 5
Average

9. COnclusion
Did you get the exact same data each time you performed the investigation? Why or why not?
Compare your results to the results of your classmates. Did everyone in the class get the same results? Why or why not?
What type of things might have been changed from group to group to cause the differences in data?  
What was the independent variable?  
What was the dependent variable?

10. In your extra exploration time, you may…
Free Time
In your extra exploration time, you may…
Changing the Independent variable of this experiment
Add soap to the Penny
Use a different type coin
Explore Surface tension with the cups, water, and Paper clips
Can you get the paper clips to float on the surface of the water?
How many will float?