Poor selection of link. Fortunately the author saw us and pointed us toward the articles instead of the raw notes: http://amasci.com/miscon/whyhard1.html#def
Am I just a pedantic nitpicker?
http://amasci.com/miscon/nitpik.html
To deeply grasp physics, often one must UN-learn the common misconceptions which were acquired in our early school careers. The misconceptions in this list are the ones believed by educators, and taught to students.
The index to the large collection is here: http://amasci.com/ele-edu.html