Scholars have pondered upon the question for centuries. Why when I ride my skateboard do I decelerate faster on dry concrete rather than wet concrete? I'm going to try to answer this question using a video and many diagrams. Click on the link below to see my glog that answers this question.
Note: Because of the comments left about this post I have edited my glog to have a note about the difference between the friction I used for my experiment versus the friction of rolling wheels. However, when I looked up the physics of rolling wheels it involved many equations and terms that we have not studied. Therefore I put a brief note at the bottom of my glog about the subject. You will find it if you scroll down on the sticky at the bottom of the page. Thank you.