Total momentum of a system with no external impressed force

Q.  The total momentum of a system __________, if no external impressed force acts on it.
- Published on 21 Sep 15

a. increases
b. decreases
c. remains constant
d. none of the above

ANSWER: remains constant

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    Discussion

  • Sravanthi   -Posted on 16 Dec 15
    - Impulse is zero, when external impressed force is zero. Hence total momentum of a system is conserved.

    - Impulse: It is an integral force which acts over a time interval.

    - A large truck has large momentum, hence it requires greater force to stop. When certain force acts on it, the velocity of truck changes and also the momentum changes.

    - Therefore, if no external impressed force acts on the truck, the momentum remains constant.

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