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MECHANICS
Often regarded as the 'ground floor' of Physics, it can be easy to think there's nothing major to be wary of or to misunderstand when teaching about forces and motion. Based on my experience, this would be an unwise assumption. Here are some things that I've either had to get clear in my own mind, or known others understand imperfectly or even teach less than ideally, together with some resources you might be interested in.
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How did Newton originally state his Laws of Motion?
N(III): the most misunderstood Law of Physics?
How to derive conservation of momentum from Newton's Laws
Showing parabolic trajectories with water streams
Air resistance - complex, but worth knowing about
Several mechanics worksheets I've written
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