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But I don't understand why the rod didn't just swing all the way down?

If one of the ends is heavier then why doesn't it swing all the way down? What's stopping after falling 5cm that wasn't there after 1cm?

In other words, if you have a rope around a pulley with a weight hanging on each end of the rope and one of the weights is heavier than the other one - won't the heavy one fall all the way down (untill the lighter weight hits the pulley or something)? Why is this different from a scale?

Thanks.