Newton's Second Law Particle Problem

[Seraph404]

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.

 

[PhanthomJay]

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?

 

[Seraph404]

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 ?

 

[PhanthomJay]

(-2N)i + (6N)j ?

Correct! (the answer would be the same regardless of the value of the constant velocity).

 

[Seraph404]

Oh okay! Thanks!