High School Physics Photo Contest: Register between March 1st and May 15th, 2018
The Physics Classroom is a great resource with additional explanations and practice problems in the Tutorial section, simulations in the "Interactives" section, and additional conceptual practice in the "Concept Builder" section.
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Khan Academy gives good in-depth explanations of each concept and walk-throughs of different practice problems of increasing complexity.
Online tone generator - in case you're interested in seeing the minimum and maximum pitch you can hear!
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Veritasium Misconception Videos from Forces Unit Lecture 3 (9/22, Newton's 3rd Law)
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