Solvequill Blog · physics · 4 min read · 2 views
Free-body diagrams that actually do work
A practical way to draw force diagrams that lead directly to equations instead of decorative arrows.
Published:
A useful force diagram is not a drawing of the object. It is a drawing of the interactions acting on the object.
The main idea
Choose one object, replace it with a dot or box, then draw only external forces: weight, normal, tension, friction, applied force.
A short example
For a block on a table pulled right, the vertical forces are and ; the horizontal forces are the pull and friction.
Check while you solve
- Pick the object before drawing arrows.
- Do not draw velocity as a force.
- Split tilted forces into components only after the diagram is clear.
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