Congratulations, Emma, Evan, and Jeffrey! The accepted value of the wood-cork static friction coefficient is 0.5, and you got 0.498598, or 0.500. Good job! (Graph in Desmos by Jeffrey)
The Friction Coefficient
Yes, physics is about quantifying, or using math as the language to describe how things work. We can observe something as simple as a block on a wooden board and graphs as beautiful as the ones below:
(The graph created on the LabQuest2 interface by Vernier)
Static and Kinetic Friction Coefficients
The accepted value of the wood-wood static friction is between 0.25 and 0.5, and you got 0.26.
Way to go, Anh, Mariama, and Alexa (graphed in Excel).
The Green Ray
This summer, I was traveling with SAS Airlines. The airlines added a tail camera view to the passengers' menu, so with a click on the screen we could choose to see the airplane flying some 40,000 feet above the ground. What a cool feature!
When watching the sunrise, I witnessed a rare occurrence of a green ray of the Sun. I have heard about that phenomenon, but have never seen it. It was astonishing to see; as a human, as a human, I just remained overwhelmed by the beauty of nature; as a physicist, I admired the refraction of light from a new perspective. Here is the picture:
I’m not sure what’s going on...
Student: Professor, I’m not sure what’s going on but the image distance continues to increase while the focal length is the same.
Instructor: I think I know what is going on. You just learned something about spherical mirrors!
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