Negative vs. Positive Signs: An Easy Guide

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Understanding negative and positive signs in physics can be simplified by remembering that the left side of the x-axis is typically negative, while the right side is positive. Friction always acts in the opposite direction of the applied force, meaning it can be considered negative when opposing motion. The definition of positive or negative is arbitrary and can be set based on the chosen coordinate system. When an object moves up a ramp, friction opposes the motion and is thus negative; conversely, when moving down, it acts in the same direction as the motion and can be considered positive. Clarity in these definitions aids in avoiding confusion regarding signs in physics.
SS2006
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im always confued about negative and positive signs, soemone give em a easy way to remember
is whatever is on the left side of the x-axis egative, and above positive always?
also when is friction negative, if the mass if moving up a ramp, is friction always negative, and if its moving down, its postitive?
thanks
 
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Friction always action in the opposite direction of the applied force. coordinate system is arbitary you can define positive or negative any way you want.
 
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