"Sinkin' Lincoln" Lab
updated pdf version of this lab 2008
to define surface tension
to determine what factors affect surface tension
to collect data on how many drops of water a penny can hold
paper cups with water
dropper bottles with clean water
dropper bottles with soapy water
Pre Lab Questions:
What is surface tension?
How many drops of clean water do you predict a penny can hold? _______
Soapy water? _______
Take your penny and rinse it well in the paper cup with clean water.
Dry it very thoroughly!
Place your penny flat on the table, heads or tails up.
Begin to add drops of clean water. Record # of drops in Table 1.
Clean penny. Repeat 2 more times.
Repeat experiment using soapy water.
Place data (average) on stem and leaf on board.
Table 1: Number of drops (half page)
|Trial 1||Trial 2||Trial 3||Average|
Figure 1: Stem and leaf of class data - clean water drops (half page)
Figure 2: Stem and leaf of class data - soapy water drops (half page)
Table 2: Summary data table of average drops (half page)
In 2-3 sentences, explain what you learned in this lab.
This lab has been modified from its original version.