Calculating Net Force: Understanding Vector Addition

[1MileCrash]

Homework Statement

Find the net force of

3.4 N i + 3.0 N j

and

3.4 N i + -3.0 N j

I entered 6.8 N i + 0 N j,

It's marking 6.8 as incorrect. Why? Do you not just sum the components??

 

[Doc Al]

Looks right to me. To find the net force, just add the components.

 

[iRaid]

Try 4.81?

 

[1MileCrash]

Then I am thoroughly confused, I'm getting all of the problems wrong and they seem pretty straightforward.

http://img402.imageshack.us/img402/8312/webassign.png

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[1MileCrash]

Try 4.81?

Why?? It does me no good to just tell me an answer.

 

[Doc Al]

Then I am thoroughly confused, I'm getting all of the problems wrong and they seem pretty straightforward.

For one thing, they ask for the acceleration, not the net force.

 

[1MileCrash]

So, does that mean that I should divide my net force by the mass scalar value?

 

[Freye]

So, does that mean that I should divide my net force by the mass scalar value?

Bingo

 

[1MileCrash]

Thanks everyone.