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PhySP18SS6.4.9 Here is a twist on the simple pulley problem. Now it is just the inertia (not the weight) of one of the boxes that is diluting gravity. In this case it is also the friction, but sometimes the surface is frictionless and it is JUST the inertial mass that is diluting gravity. Physics teachers love this problem because it gets at one of their favorite subjects — separating out gravitational mass and inertial mass).

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