Finding Impossible Force with Two Given Forces

[sharkey1314]

Homework Statement

I got two forces acting on an object. I have the magnitude of the forces, 6 N and 2 N. Then I'm asked to find out what force is impossible to produce with these two forces.

Homework Equations

The Attempt at a Solution

I have no idea where to begin with. Maybe i didn't think hard enough...

 

[bp_psy]

Are you sure it's not just asking for an example of a force that can't be produced? This is a very weird question because the number of possible answers is infinite.
Post the exact wording of the question.

 

[sharkey1314]

Theres a choice between 2N and 6N. Sorry. It's a multiple choice question. The other 2 answers are 8N and 4N which is quite obviously can be produced.

 

[bp_psy]

Theres a choice between 2N and 6N. Sorry. It's a multiple choice question. The other 2 answers are 8N and 4N which is quite obviously can be produced.

Try drawing some triangles.You will see that only one of those vectors can be produced by adding the given vectors.

 

[sharkey1314]

It will be an isosceles triangle right ?

 

[sharkey1314]

Okay i found out the answers by using cosine rule. Are there some insights on this matter ? lol..

 

[bp_psy]

It will be an isosceles triangle right ?

Yes since you want to get either 6N or 2N using a 6N and a 2N.edit:

Okay i found out the answers by using cosine rule. Are there some insights on this matter ? lol..

The exercise is meant to teach you to watch out for answers that do no make sense.