Join TSR now and get all your revision questions answeredSign up now

MCQ related to momentum. HELP!

Announcements
    • Thread Starter
    Offline

    1
    ReputationRep:
    Name:  image.jpeg
Views: 30
Size:  73.0 KB

    I really don't understand this question. The correct answer is C but I don't get why. Please help!*
    Offline

    3
    ReputationRep:
    (Original post by ibs11)
    Name:  image.jpeg
Views: 30
Size:  73.0 KB

    I really don't understand this question. The correct answer is C but I don't get why. Please help!*
    Hello there,

    It is important to remember that, in this collision, linear momentum is conserved. This means that the magnitude of the change in momentum of each of the objects should be the same, as to result in the overall momentum change being  0 . This renders statement  II to be false. As impulse is equivalent to change in momentum,  I must also be false. In order for the changes in momentum to be the same, the velocity of the small car must change more, as the car has a lower mass ( \Delta p = m \Delta v ). Statement  III is thus true and the correct response is therefore (c).

    I hope that this has been helpful,

    Smithenator5000
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by Smithenator5000)
    Hello there,

    It is important to remember that, in this collision, linear momentum is conserved. This means that the magnitude of the change in momentum of each of the objects should be the same, as to result in the overall momentum change being  0 . This renders statement  II to be false. As impulse is equivalent to change in momentum,  I must also be false. In order for the changes in momentum to be the same, the velocity of the small car must change more, as the car has a lower mass ( \Delta p = m \Delta v ). Statement  III is thus true and the correct response is therefore (c).

    I hope that this has been helpful,

    Smithenator5000
    Thank you so much! Really helped me out *
    Offline

    3
    ReputationRep:
    (Original post by ibs11)
    Thank you so much! Really helped me out *
    You're very welcome.
 
 
 
Poll
Do you have exam superstitions?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.