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A pictorial device which analyzes forces present on any body with the use of vectors. Allows easier grasping of problems involving either objects at equilibrium or in motion. Can be used to predict presence of forces.
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Why do the masses in an Atwood's machine move?
$\mu$ is coefficient of friction
Both masses move because $F_\mathrm{friction} = \mu F_\mathrm{normal}$ and as only $m_2$ is lying on the floor its maximum resistance to the motin is $F_\mathrm{fric …