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17. (a) The freebody diagram for the block is shown below.
G
F
is
the applied force,
N
F
G
is the normal force of the wall on the block,
G
f
is the force of friction, and
mg
G
is the force of gravity. To
determine if the block falls, we find the magnitude
f
of the force
of friction required to hold it without accelerating and also find
the normal force of the wall on the block. We compare
f
and
μ
s
F
N
.
If
f
<
s
F
N
, the block does not slide on the wall but if
f
>
s
F
N
, the
block does slide. The horizontal component of Newton’s second
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 Spring '08
 Any
 Physics, Force, Friction, Gravity

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