# Traction and driven-axle load
# Scope: Coulomb traction on a level surface; driven normal load supplied.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

normal = 1000 N
friction = 0.6
demand = 400 N

available := normal*friction [N]
reserve := available-demand [N]

check traction sufficient: demand <= available

scenario alternative: normal = 800 N