Derivation of law of conservation of momentum class 9

Asked by admin @ 17/08/2021 in Science viewed by 311 People

State and derive law of conservation of momentum

Answered by admin @ 17/08/2021

Answer:

STATEMENT:

Law of conservation of momentum : It states that if a group of objects are interacting with each other, then their total momentum remains conserved before and after the interaction, provided no external force acts on them.

DERIVATION :

Law of conservation of momentum states that when two objects collide with each other , the sum of their linear momentum always remains same or we can say conserved and is not effected by any action, reaction only in case is no external unbalanced force is applied on the bodies.

DERIVING THE LAW OF CONSERVATION OF MOMENTUM-

Let,

mA = Mass of ball A

mB= Mass of ball Ba

uA= initial velocity of ball A

uB= initial velocity of ball B

vA= Velocity after collision of ball A

vB= Velocity after collision of ball B

Fab= Force exerted by A on B

Fba= Force exerted by B on A

Now,

Change in momentum of A= momentum of A after collision - momentum of A before collision

= mA vA - mA uA

Rate of change of momentum A= Change in momentum of A/ time taken

= mA vA - mA uA/t

Force exerted by B on A (Fba)=

Fba= mA vA - mA uA/t. [i]

In the same way,

Rate of change of momentum of B=

mV vB - mB uB/t

Force exerted by A on B (Fab)=

Fab= mB vB - mB uB/t. [ii]

Newton's third law of motion states that every action has an equal and opposite reaction, then,

Fab= -Fba [ ' -- ' sign is used to indicate that 1 object is moving in opposite direction after collision]

Using [i] and [ii] , we have

mB vB - mB uB/t = - (mA vA - mA uA/t)

mB vB - mB uB= - mA vA + mA uA

Finally we get,

mB vB + mA vA = mB uB + mA uA

This is the derivation of conservation of linear momentum.

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