to keep it from falling. What is the minimum force perpendicular to the wall that you must exert on the frame to keep it stationary? The coefficient of kinetic friction for the two surface in contact is .42.While deciding where to drive a supporting nail, you are pressing a 18-N picture frame against the wall?
Fy = Fy
ma = Fr - Fg
0 = Fr - mg
18 = F(applied) * coefficient
18 = .42F
F = 42.857NWhile deciding where to drive a supporting nail, you are pressing a 18-N picture frame against the wall?
The downward force on the picture is 18N. The perpendicular force into the wall F x .42 =
18N F=18/.42=42.86N
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