Investigating Static Forces in Nature: The Mystery of the Gecko Physical Science Lesson 1 How Can a Gecko Walk on a Ceiling? NanoSize Me Tricky Feet Videos: http://www.mcrel.org/nanoleap/multimedia/index.asp How Can a Gecko Walk on a Ceiling?

Data Table Observations Interpretations Makes use of senses Makes use of instrumentation (when possible) Uses illustrations and labels Are statements and not questions Qualitative: Description of characteristics Quantitative: Numeric or measurements Explains how/why based on what you scientifically observe May show diagrams or illustrations of how you think something works Bases explanation on scientific observation, experience, or something learned earlier (extant data) How Can a Gecko Walk on a Ceiling?

Observations Make observations about the following images. Note similarities and differences. Image 1.2 Image 1.1 Image 1.3 How Can a Gecko Walk on a Ceiling?

Interpretations Make interpretations about how the organism is “sticking” or “adhering” to a surface. Image 1.2 Image 1.1 Image 1.3 How Can a Gecko Walk on a Ceiling?

Questions What do the images have in common? What do you observe about the surfaces and textures in these images? What do you interpret about how the gecko’s foot interacts with the surface? 4. What questions do you have or additional information do you need to know in order to understand what makes a gecko adhere to surfaces? How Can a Gecko Walk on a Ceiling?

More Questions 5. What are some possible methods for the gecko to adhere to a surface? 6. Describe how you made your observations in today’s lesson: a. What tools did you use? b. Were your observations at the visible or invisible scale? c. What is the dominant force at this visible scale? 7. What variables affect the force between the animal and the surface? How Can a Gecko Walk on a Ceiling?

Making Connections Describe one or two ideas that you learned during this lesson. How do you think the gecko sticks to the ceiling? What should we explore next? How Can a Gecko Walk on a Ceiling?

Flow Chart Flow Chart How Can a Gecko Walk on a Ceiling? Scale: Visible Dominant Force: Gravity Tools: Eye 2. What Do We Mean When We Speak About Surfaces in Contact? 3. What Are Your Ideas of Small Sizes? 4. What Do We Learn When We Look More Closely? 5. What Types of Forces Can Hold Objects Together? 6. How MUCH Force Is Needed to Make an Object Stick? What Factors Affect the STRENGTH of Force Acting? 7. How Do We Measure Forces at the Nano Level? 8. How Can a Gecko Walk on a Ceiling? How Can a Gecko Walk on a Ceiling?