Free-body diagram builder

Every arrow on a free-body diagram is a force, so every label is F with a subscript: Fw, FN, Ff, FT, Fpush. Add the vectors you need, orient each one, name it, then check. Arrow length is adjustable, but it is not graded. Angles use 3-4-5 triangles (37° and 53°), and g = 10 m/s².

The 7-step routine
  1. Isolate one object and show only forces acting on it. For a connected system, draw one FBD per object.
  2. Draw the weight straight down.
  3. Contact scan: trace the block’s outline. Anything touching it may exert a force.
  4. Add pulls and pushes at their real angles. Ropes pull away from the block.
  5. Add a normal force only if a surface touches the block: perpendicular, away from the surface.
  6. Add friction only if the problem has it: parallel to the surface, opposing slipping relative to the surface.
  7. Check: do the forces match what the block is doing? Then write ΣF = ma along each axis.