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m
A
= 10 kg), and
mg
B
G
is the force of gravity on block
B
.
θ
= 30° is the angle of incline.
For
A
we take the +
x
to be uphill and +
y
to be in the direction of the normal force; the
positive direction is chosen
downward
for block
B
.
Since
A
is moving down the incline, the force of friction is uphill with magnitude
f
k
=
μ
k
F
N
(where
k
= 0.20). Newton’s second law leads to
sin
0
cos
0
0
kA
A
NA
BB
T f
ma
Fm
g
mg T ma
−+
=
=
−=
=
for the two bodies (where
a
= 0 is a consequence of the velocity being constant). We
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Force, Friction, Gravity

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