(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

How to know when one is suppose to add or subtract to get the normal force of an object.

2. Relevant equations

F_{N}= F_{g}, F_{N}= F sin(-)

3. The attempt at a solution

I believe to get the normal force of a 2 kg object when it is being pulled upwards by a force of 45 Newtons at an angle of 40 degrees is:

F_{N}= 45 N sin(40) - 19.6 N

F_{N}= 9.32 N

or is it:

F_{N}= 45 N sin(40)

F_{N}= 28.9 N

Which one is correct? How do I know when to add or subject the normal force and gravitational force?

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# Homework Help: Normal force

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