Newton's Second Law Particle Problem

  • Thread starter Seraph404
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Homework Statement



While two forces act on it, a particle is to move at the constant velocity v = (3 m/s)i - (4 m/s)j. One of the forces is F1 = (2N)i + (-6N)j. What is the other force?


Homework Equations



Fnet = ma


The Attempt at a Solution



Well, I'm really just wanting a hint. I know that the acceleration is zero because the velocity is constant. So how do I use velocity to find the second force? Surely I'm missing something fundamental here. Once again, just a hint would be nice.
 

Answers and Replies

  • #2
PhanthomJay
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Homework Statement



While two forces act on it, a particle is to move at the constant velocity v = (3 m/s)i - (4 m/s)j. One of the forces is F1 = (2N)i + (-6N)j. What is the other force?


Homework Equations



Fnet = ma


The Attempt at a Solution



Well, I'm really just wanting a hint. I know that the acceleration is zero because the velocity is constant. So how do I use velocity to find the second force? Surely I'm missing something fundamental here. Once again, just a hint would be nice.
You pretty much gave yourself a hint when you said that there is no net force. Since one of the two forces are given, what's the other one?
 
  • #3
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You pretty much gave yourself a hint when you said that there is no net force. Since one of the two forces are given, what's the other one?


(-2N)i + (6N)j ?
 
  • #4
PhanthomJay
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(-2N)i + (6N)j ?
Correct! (the answer would be the same regardless of the value of the constant velocity).
 
  • #5
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Oh okay! Thanks!
 

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