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Test Index
Class 11 NEET Physics Laws of Motion Questions
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© examsnet.com
Question : 20
Total: 75
A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches
30
∘
, the box starts to slip and slides
4.0
m
down the plank in
4.0
s
.
The coefficients of static and kinetic friction between the box and the plank will be, respectively
[NEET 2015]
A 0.5 and 0.6
0.4 and 0.3
0.6 and 0.6
0.6 and 0.5
Validate
Solution:
👈: Video Solution
Coefficient of static friction,
µ
s
=
tan
30
∘
=
1
√
3
=
0.577
≅
0.6
S
=
u
t
+
1
2
a
t
2
4
=
1
2
a
(
4
)
2
⇒
a
=
1
2
=
0.5
[
∵
s
=
4
m
and
t
=
4
s
given
]
a
=
g
s
i
n
θ
−
µ
k
(
g
)
cos
θ
⇒
µ
k
=
0.9
√
3
=
0.5
© examsnet.com
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