Question

A box with mass 1.74 kg is being pulled across a rough surface
at a constant speed with a coefficient of kinetic friction
µ_{k} = 0.366. The pulling force has a magnitude of 11.2 N
and is directed at an angle 32.8 degrees above horizontal. If the
box is dragged a distance of 10.3 m, what is the total energy lost
to friction? (Hint: be sure to account for the upward component of
the pulling force, and note that the energy lost to friction is
being compensated for by the work added by the pulling force).

Answer #1

**Concept** - first find the frictional force
acting on the block and use the magnitude of fiction force to find
the energy lost using the displacement as shown below

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