What Causes an Object to Stop after a Collision?

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AI Thread Summary
In a collision between two balls, the conservation of momentum dictates that the total momentum before the collision equals the total momentum after. In this scenario, a 0.25 kg ball traveling at 1.7 m/s collides with a 0.18 kg ball moving at 2.5 m/s, resulting in the 0.25 kg ball reversing direction at 0.10 m/s. The 0.18 kg ball's speed after the collision is determined to be 0 m/s, indicating it comes to a complete stop. There are no specific indicators that suggest an object will stop in a collision other than the results from momentum calculations. Understanding momentum conservation is crucial in analyzing collision outcomes.
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Homework Statement



Two balls roll directly towards each other. The 0.25kg ball has a speed of 1.7m/s. The 0.18kg ball has speed of 2.5m/s. After the collision, the 0.25kg ball has reversed its direction and has a speed of 0.10m/s . What is the magnitude and direction of the 0.18 kg ball after hte collision?


Homework Equations


P(total)=P'(total)


The Attempt at a Solution



I know the answer... IT's 0 m/s . Further question though:

On a test, I'd be questioning that result. As I did when I first obtained it in the homework... So I thought to myself: Zero tends not to just come out of nowhere... There's usuall an indicator that it's coming. What is the indicator that one of the objects in a collision will stop? Is there any sort of indicator in this case?

Thanks!

Mike
 
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There's no special indicator in this case other than the momentum conservation calculation.
 

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