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Physics Problem of the Week for Oct 26 2015

Block and friction

A 4 kg red block is positioned at rest, 10 m high on a ramp as shown. The ramp is frictionless, other than a 10 cm long dark rough patch, that has a coefficient of kinetic friction of $\mu=0.3$. How far from the left edge of the rough patch will the block eventually come to rest for good (on the rough patch)?

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Group solutions work when someone suggests the next step toward this problem's solution.

Steps accepted thus far

  • First, find out how much potential energy the box has, which is $mgh$ or $4\cdot 9.8\cdot 10$=$400$ J.

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