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II. Conservation of Momentum

 

 

 

 

Collision/3 Laws

 

 

#22

 

Total Momentum
Before Interaction

=

 

Total Momentum
After Interaction

 

m1v1 + m2v2 = m1v1′ + m2v2

 

 

 

 

Momentum is only conserved
in a totally elastic collision

Totally Elastic Collision?

 

 

 

 

What is the momentum

of the big fish after it

 swallows the little fish?

 

 

 

 

 

 

-4 kgm/s

Total momentum before =
 Total momentum after

 

 

 

Ex 4) What is the magnitude of the total momentum of these carts?

Total momentum = m1v1 + m2v2

Total mom. =

(4.0 kg)(3 m/s)+6.0kg(-3.0m/s)

 

= 12. kgm/s + -18. kgm/s 

 

= -6.0 kgm/s

 

 

 

 

 

"Left train momentum

= 30 kgm/s.

What is the momentum

 of the right train?"

What's the total momentum before the collision?

After the collision?

 

 

 

 

 

 

 

Answer: -30 kgm/s

 

 

 

 

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