Gravity: A Lesson in Proportionality

#breakthroughjuniorchallenge2022 #breakthroughjuniorchallenge I make some simplifications in the video, one of which is Newton's 2nd Law of Motion. It actually states that force causes a change in momentum, but if mass is constant, it is the same as F=ma. Another is the omission of GMm from the equation, which I do because the masses being directly proportional to the force of gravity is very intuitive, and the main focus is on justifying the inverse proportion to r^2, not explaining the equation as a whole. If I were to make some changes to the video for the sake of the competition, I would add a quick sequence of calculus equations which detail the simplification of Newton's 2nd Law of Motion, so as to increase my "difficulty" rating. I did not know about the rubric beforehand, and now that I see it, it seems arbitrary in some ways. How does the difficulty of the topic contribute to the effectiveness of a teaching video? Adding a calculus sequence would increase the difficulty to college level, but it would only confuse the audience if they didn't know calculus. Another change I would make is asking the audience to think about how they can justify other equations that they have seen before, perhaps Coulomb's Law, since it is very similar in logic. Overall, to anyone who participated in the competition, don't stop making educational content just because the competition is over.