Unformatted text preview: the wrong direction for this component. Thus,
.* & is negative
pointed downwards. .* & is Magnitude:
.* .* % ' .* & P32. A uniform ladder of mass and length leans at an angle against a frictionless
wall, Fig. 1272. If the coefficient of static friction between the ladder and the ground is
, / what is the minimum angle at which the ladder will not slip?
Solution:
FN2 θ y x FN1 θ
mg θ θ
Ff r (
cos
cos
0 0
1 0 sin 1 tan % 0
0 & sin tan 0
0 5 The friction force has a maximum which it cannot exceed:
2 ,0
2,
tan
tan 3 11
,11 , tan
P53. What is the maximum tension possible in a 1.00 mm diameter nylon tennis racket
string? If you want tighter strings, what do you do to preven...
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 Fall '08
 engle
 mechanics, Force, Friction, Mass, Static Equilibrium, Work, Cos, Extensor muscle

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