A window washer pushes his scrub brush up a vertical window at constant speed by applying a force $\vec{F}$ as shown in Figure 5.74 . The brush weighs $12.0 \mathrm{~N},$ and the coefficient of kinetic friction is $\mu_{\mathrm{k}}=0.150 .$ Calculate (a) the magnitude of the force $\overrightarrow{\boldsymbol{F}}$ and (b) the normal force exerted by the window on the brush.
Added by Albert G.
Step 1
Identify the forces as the force applied ($\vec{F}$), the weight of the brush ($mg$), the normal force ($N$), and the kinetic friction force ($f_k$). Show more…
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