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Class 11
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Physics
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Laws of Motion
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Medium Questions
Laws Of Motion
Physics
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A body of mass m is rotated at uniform speed along a vertical circle with the help of light string. If
T
1
a
n
d
T
2
are tensions in the string when the body is crossing highest and lowest point of the vertical circle respectively, then which of the following expressions is correct?
A
T
2
−
T
1
=
6
m
g
B
T
2
−
T
1
=
4
m
g
C
T
2
−
T
1
=
2
m
g
D
T
2
−
T
1
=
m
g
Medium
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Statement I: The max value of force F such that the block shown does not move is
c
o
s
θ
μ
m
g
where
μ
is the coefficient of friction between block end surface.
Statement II: Frictional Force = (Coefficient of friction) x (Normal reaction)
A
Statement 1 is True, Statement 2 is True; Statement 2 is a correct explanation for Statement 1
B
Statement 1 is True, Statement 2 is True; Statement 2 is NOT a correct explanation for Statement 1
C
Statement 1 is True, Statement 2 is False
D
Statement 1 is False, Statement 2 is True
Medium
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>
A body is moving in a vertical circle such that the velocities of body at different points are critical. The ratio of velocities of body at angular displacements
6
0
0
and
1
2
0
0
from the lowest point is:
A
5
:
2
B
3
:
2
C
3
:
1
D
2
:
1
Medium
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>
A ball of mass 0.6kg attached to a light inextensible string rotates in a vertical circle of radius 0.75m such that it has speed of 5 m/s when the string is horizontal. Tension in string when it is horizontal on other side is:
(
g
=
1
0
m
s
−
2
)
A
3
0
N
B
2
6
N
C
2
0
N
D
6
N
Medium
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>
A simple pendulum is oscillating with an angular amplitude
6
0
0
. If mass of bob is
5
0
g
, the tension in the string at mean position is:
Consider:
g
=
1
0
m
s
−
2
, length of the string,
L
=
1
m
.
A
0
.
5
N
B
1
N
C
1
.
5
N
D
2
N
Medium
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>
Regarding linear momentum of a body
a. It is a measure of quantity of motion contained by the body
b. Change in momentum is the measure of impulse
c. Impulse and acceleration act in opposite direction to the change in momentum
d. In the case of uniform circular motion the linear momentum is conserved.
A
a & b are true
B
b & c are true
C
c & d are true
D
a, b & c are ture
Medium
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>
A ball of mass 'm' is projected from the ground with a speed 'u' at an angle '
α
' with the horizontal. The magnitude of the change in momentum of the ball over a time interval from begining till it strikes the ground again is
A
2
m
u
sin
α
B
2
m
u
cos
α
C
2
m
u
cos
α
D
2
m
u
sin
α
Medium
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>
A person carries a hammer on his shoulder and holds the other end of its light handle in his hand. Let
y
be the distance between his hand and the point of support. If the person changes
y
, the pressure on his hand will be proportional to:
A
y
B
y
2
C
y
1
D
y
2
1
Medium
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An impulse is supplied to a moving object with the force at an angle of
1
2
0
0
with the velocity vector. The angle between the impulse vector and the change in momentum vector is
A
1
2
0
0
B
0
0
C
6
0
0
D
2
4
0
0
Medium
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>
A pilot of mass
m
can bear a maximum apparent weight
7
times of
m
g
. The aeroplane is moving in a vertical circle. If the velocity of aeroplane is
2
1
0
m
/
s
while driving up from the lowest point of vertical circle, the minimum radius of vertical circle should be:
A
3
7
5
m
B
4
2
0
m
C
7
5
0
m
D
8
4
0
m
Medium
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>