Question about equilibrium

  • #1

Homework Statement



If I have a force of 6N in the negative i hat direction and a force of 3N in the positive j hat direction , what third force will cause the object to be in equilibrium?

Homework Equations





The Attempt at a Solution



I got the answer to be the square root of 6^2+3^2 to make it like a triangle. But Im not sure if this is right and in what direction it should be pointed.
 

Answers and Replies

  • #2
424
0
for the direction you can use trig .. let the angle of the force required from horizontal be x..then how can you find tan x in terms of known data?

Your magnitude of force is correct so you've got to worry only about direction; :smile:
 
  • #3
The possible answers says it can be clockwise or counter clock wise I cant figure out which one. I used tan and got my degrees. But idk if the vector is pointing toward the y axis force or away from it.
 
  • #4
424
0
try drawing the FBD and see how the forces act.
 
  • #5
Ok I did, so the object is moving to the left and up. So the force I need will be opposite of that? And it will be the degrees below the positive x axis instead of to the right of the negative y axis, because its moving faster to the left than up?
 
  • #6
424
0
yes ... just like 2 guys push a car from the front and other two from back!! :biggrin:
 

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