Class 9 | Physics | Force and Laws of Motion- Conservation of Momentum
Channel: Tutelf
Date: 2020-10-24

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CBSE | NCERT | Class 9 | Physics | Force and Laws of Motion- Topic - Conservation of momentum

Law of Conservation of Momentum – The sum of momenta of two objects remains same even after collision. In other words, the sum of momenta of two objects before collision and sum of momenta of two objects after collision are equal. Mathematical Formulation of Conservation of Momentum: Suppose that, two objects A and B are moving along a straight line in same direction and the velocity of A is greater than the velocity of B. 

Equation  says  that  total  momentum  of  object  A  and  B  before  collision  is  equal  to  the total momentum of object A and B after collision. We observe that the total momentum of the two balls remains unchanged or conserved provided no other external force acts. As a result of this  ideal  collision  experiment,  we  say  that  the  sum  of  momenta  of  the  two  objects  before collision  is  equal  to the  sum  of  momenta  after  the  collision  provided  there  is  no  external unbalanced force acting on them. This is known as the law of conservation of momentum. This statement can alternatively be given as the total momentum of the two objects is unchanged or conserved by the collision.

CONSERVATION OF MOMENTUM – PRACTICAL APPLICATION

Bullet  and  Gun –  When  bullet  is  fired  from  a  gun,  gun  recoils  in  the  opposite  direction  of bullet.  The  momentum  of  bullet  is equal to momentum of gun. Since, the bullet is has very small  mass  compared  to  the  gun,  hence  velocity  of  bullet  is  very  high  compared  to  the recoil of gun. In the case of firing of bullet, law of conservation of momentum is applied as usual. 
When a cricket ball is hit by bat, the Law of Conservation of Momentum is applied. 

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