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Standard VIII
Physics
Moment of Force
A drum brake ...
Question
A drum brake is shown in the figure. The drum is rotating in an anticlockwise direction. The coefficient of friction between drum and shoe is 0.2. The dimensions shown in the figure are in mm. The braking torque (in Nm) for the brake shoe is
64
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Solution
The correct option is
A
64
Taking
∑
M
o
=
0
⇒
1000
×
800
=
F
t
×
100
+
R
N
×
480
⇒
8000
=
F
f
+
4.8
R
N
F
f
=
μ
R
N
=
0.2
R
N
∴
0.2
R
N
+
4.8
R
N
=
8000
or
R
N
=
8000
5
=
1600
N
∴
F
f
=
μ
R
N
=
0.2
×
1600
=
320
N
Braking torque,
T
=
F
f
×
r
=
320
×
0.2
=
64
N
m
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0
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A drum brake is shown in the figure. The drum is rotating in an anticlockwise direction. The coefficient of friction between drum and shoe is 0.2. The dimensions shown in the figure are in mm. The braking torque (in Nm) for the brake shoe is
Q.
A short shoe external drum brake is shown in the figure. The diameter of the brake drum is 500 mm.The dimensions a=1000 mm, b= 500 mm and c= 200 mm. The coefficient of friction between the drum and the shoe is 0.35. The force applied on the lever F = 100 N as shown in the figure. The drum is rotating anticlockwise. The braking torque on the drum is (round off to two decimal places).
Q.
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Q.
The schematic of an external drum rotating clockwise engaging with a short show is shown in the figure. The shoe is mounted at point Y on a rigid lever XYZ hinged at point X. A force F= 100 N is applied at the free end of the lever as shown. Given that the coefficient of friction between the shoe and the drum is 0.3, the braking torque (in Nm) applied on the drum is(correct to two decimal places)
Q.
The forces
F
1
and
F
2
in a brake and the direction of rotation of the drum are as shown in the figure. The coefficient of friction is
0.25.
The angle of wrap is
3
π
2
radians. It is given that
R
=
1
m and
F
2
=
1
N
.
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