Drop water on the different materials and observe how the water looks and behaves.
What do you notice?
One of these materials will allow you to separate a single drop into several drops and then reunite them by dragging the dropper. Can you figure out which material will do this? Why does it work on this material?
How close together can you put two drops of water without them touching? Can a drop of water bounce off another drop of water? What shapes are the drops of water as they fall through the air?
Does water do the same thing on all surfaces? What evidence do you have to support your claim?
Students record their observations about each material.
Teacher Background Information:In all systems within which water interacts with another surface, both adhesion and cohesion are factors. When cohesion is more of a factor, the water forms spherical droplets; when adhesion is more of a factor, we get sheets of water.
How Does Water Move Through Paper?
Other Properties at Work:
This lesson is aligned with the NGSS Crosscutting Concepts of Systems and Matter and Energy.
This post and lesson are also aligned with the NGSS Science Practices of Planning and Carrying out Investigation, Constructing Explanations, Engaging in Argument from Evidence and Obtaining, Evaluating and Communicating Information.