For a mass on an incline plane, is the downward force mg cos Θ or -mg cos Θ?(adsbygoogle = window.adsbygoogle || []).push({});

I'm inclined to state there should be a negative but from my lectures, the negative does not appear to be stipulated. I was wondering if it's was a mistake by the lecturer.

mg cos Θ + F_{N}= 0

mg cos Θ = -F_{N}

the downward force must be of equal magnitude to the normal force-but opposite direction.

This makes sense mathematically.

However, geometrically, it does make sense for the down ward force to be -mg cos Θ.

Could someone clarify?

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# Mg cos theta in context of incline plane

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