First, draw the block and slope, then tilt your axes so one is parallel to the incline—gravity's pull will split into components. I learnt this from my regional-language physics videos, pausing and replaying, just like how I learn new glaze recipes step-by-step. People say to always put the normal force straight up, but my life at the wheel says the useful direction is along the work in front of you—so axes along the slope, just like centering clay requires aligning with its natural tilt.
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