Springs provide a nice example of NON-constant force. We know Hooke's law, F = -kx, where x is the displacement of the spring from its equilibrium position. Keep in mind the - sign is for direction: the force always tries to bring a spring back to equilibrium, which is in the opposite direction relative to the direction of the displacement (a point of stable equilibrium). Here are examples of using energy conservation to solve spring problems.

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Nice blog! I spent forever browsing the web trying to find out how to solve for the the electric field with a non uniform charge density for my Math Methods class but had no luck till I found your old post. You explained it great. I checked out some of your other posts and found them interesting keep up the good work. I will be sure to bookmark your blog.

ReplyDeleteThank you, Alex. I hope these help students, so please make as much use as you feel is necessary. I just hope Screentoaster never shuts down, as these all are housed on their servers!

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