• Support PF! Buy your school textbooks, materials and every day products Here!

Help with momentum physics problem

  • #1
1
0
Ball A, which weighs 2 kilograms, is moving at 0.5 meters/second and strikes stationary Ball B at the direct center of the ball.
Ball B, which weighs 3 kilograms, moves off at 0.3 meters/second and in the same original direction Ball A was moving. Ball A continues to move forward, but only at 0.1 meters/second. Is momentum conserved? Explain.


I don't even know where to start, or what to do so could I have some help with this?
 

Answers and Replies

  • #2
210
15
The momentum of the system is conserved if it's the same before the strike and after...
What's the momentum before?
What about after?
 
  • #3
The system consists of two bodies: ball A and ball B
All the movements are performed along one axis: OX. Let the positive direction coincide with the direction of ball A movement.
Then, the momentum before the strike
P1 = mAvA + mBvB
vA = 0.5 m/s, vB = 0
The momentum after strike
P2 = mAuA + mBuB
uA = 0.1 m/s, uB = 0.3 m/s

So, the conclusion is clear but still up to you)
 

Related Threads on Help with momentum physics problem

Replies
7
Views
2K
Replies
2
Views
9K
Replies
6
Views
2K
Replies
4
Views
2K
Replies
3
Views
10K
Replies
13
Views
1K
Top