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AMU Engineering 2019 solved paper Solved Paper
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© examsnet.com
Question : 14
Total: 150
A body of mass
2
k
g
is kept by pressing to a vertical wall by a force of
100
N
. The friction between wall and body is
0.3
. Then the frictional force is equal to
6
N
20
N
600
N
700
N
Validate
Solution:
Given, mass of body
=
2
k
g
According to question,
∵
Friction force due to
100
N
f
=
M
R
=
0.3
×
100
=
30
N
but force due to gravitation,
F
=
m
g
=
2
×
10
=
20
N
So, there is no acceleration in box i.e.
a
=
0
Hence, friction force will be
f
=
20
N
© examsnet.com
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