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Class 11
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Physics
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Laws of Motion
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Newton's Second Law of Motion
Newton's Second Law of Motion
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Newton's Second Law of Motion
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Important Questions
A machine gun fires a bullet of mass
4
0
g
with a velocity
1
2
0
0
m
/
s
. The man holding it can exert a maximum force of
1
4
4
N
on the gun. How many bullets can be fired per second at the most?
Medium
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>
State and prove the law of conservation of momentum.
Medium
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>
A
0
.
5
k
g
ball moving with a speed of
1
2
m
/
s
strikes a hard wall at an angle of
3
0
o
with the wall. It is reflected with the same speed and at the same angle, as shown in figure. If the ball is in contact with the wall for
0
.
2
5
s
the average force acting on the wall is
Medium
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>
A cricket ball of mass 150 g is moving with a velocity of 12 m/s and is hit by a bat so that the ball is turned back with a velocity of 20 m/s. The force of the blow acts for 0.001 & on the ball. Find that force?
Medium
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>
A rigid ball of mass m strikes a rigid wall at
6
0
o
and gets reflected without loss of speed as shown in the figure below. The value of impulse imparted by the wall on the ball will be :
Medium
NEET
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>
In the given figure, the position-time graph of a particle of mass
0
.
1
kg
is shown. The impulse at
t
=
2
sec
is:
Medium
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>
A batsman hits back a ball straight in the direction of the bowler without changing its initial speed of
1
2
m
s
−
1
. If the mass of the ball is
0
.
1
5
k
g
, determine the change in momentum of the ball. (Assume linear motion of the ball)
Easy
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>
A hockey ball of mass 200 g travelling at
1
0
m
s
−
1
is struck by a hockey stick so as to return it along its original path with a velocity of
5
m
s
−
1
. Calculate the change of momentum which occurred in the motion of the hockey ball by the force applied by the hockey stick:
Medium
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>
A force time graph for the motion of a body is shown in figure. Change in linear momentum between
0
and
8
s
is :
Hard
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>
If bullet of mass
5
g
m
moving with velocity
1
0
0
m
/
s
e
c
, penetrates the wooden block upto
6
c
m
. Then the average force imposed by the bullet on the block is
Medium
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>