This webpage from PBS' NOVA explores the electrostatic forces that cause lightning and engages students with an "Ask The Expert" question-answer set. Different types of lightning are described along with their pictures....
This Exploratorium site presents the ray model of pinhole images. It develops the concepts necessary to understand these images and illustrates them with clear, easy-to-understand diagrams. It explains several examples...
This website allows students to design a simple roller coaster, and it then evaluates the roller coaster based on physical principles such as potential energy and circular motion. It rates the roller coaster on safety...
This website from the University of Guelph's physics department offers a tutorial on free body diagrams. The tutorial includes an explanation of what free body diagrams are, example problems, a self-test, and a free...
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