a wooden ball of mass 60 kg is at rest at horizontal surface of platform .A Coolie require a force of 78.4 Newton to just slide. Once the motion begins, force of 39.4 Newton is sufficient to keep box moving with uniform velocity. calculate the coefficient of Static and kinetic friction
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Answered by
0
Answer:
Force required to just slide the object
F
a
p
p
l
i
e
d
=
78.4
N
Static friction
F
s
=
F
a
p
p
l
i
e
d
Or
μ
s
m
g
=
78.4
Or
μ
s
×
60
×
9.8
=
78.4
⟹
μ
s
=
0.133
Kinetic friction :
Force required after sliding begins
F
=
39.4
N
Static friction
F
k
=
F
Or
μ
k
m
g
=
39.4
Or
μ
k
×
60
×
9.8
=
39.4
⟹
μk = 0.067
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