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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
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Momentum and its Direction
Momentum and its Direction
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REVISE WITH CONCEPTS
What is Momentum?
Example
Definitions
Formulaes
>
Linear Momentum
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Newton's Second Law of Motion
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Second Law of Motion as Rate of Change of Momentum
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QUICK SUMMARY WITH STORIES
What is Momentum?
3 mins
Introduction to Conservation of Linear Momentum
3 mins
Newton's Second Law of Motion
3 mins
Numericals on Newton's Second Law of Motion
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Important Questions
A machine gun fires a bullet of mass
$40g$
with a velocity
$1200m/s$
. The man holding it can exert a maximum force of
$144N$
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
$0.5kg$
ball moving with a speed of
$12m/s$
strikes a hard wall at an angle of
$30_{o}$
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
$0.25s$
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
$60_{o}$
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
$0.1kg$
is shown. The impulse at
$t=2sec$
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
$12ms_{âˆ’1}$
. If the mass of the ball is
$0.15Âkg$
, 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
$10Âms_{âˆ’1}$
is struck by a hockey stick so as to return it along its original path with a velocity of
$5Âms_{âˆ’1}$
. 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
$8s$
is :
Hard
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>
If bullet of mass
$5$
$gm$
moving with velocity
$100$
$m/sec$
, penetrates the wooden block upto
$6$
$cm$
. Then the average force imposed by the bullet on the block is
Medium
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>