Reaction forces for a rigid body under applied forces, moments, and equivalent static inertia loads — no FE software required
Calculation tool. Reaction-geometry validation and the reaction-force solve are executed on a private server. This public page contains the interface only, not the core calculation formulas.
Setup
Applies −9.81 m/s² in Z at every active mass location.
Equivalent static inertia force F = −m·a is applied at every active mass location.
Message box
Fill the template in Excel (or just type into the page below), then import it back — or type everything in directly. Either way, results always show on this page.
Applied forces, moments & masses (up to 15 entries)
#
Use
X (mm)
Y (mm)
Z (mm)
Fx (N)
Fy (N)
Fz (N)
|F| (N)
Mx (N·mm)
My (N·mm)
Mz (N·mm)
|M| (N·mm)
Mass?
Mass (kg)
Reactions (up to 15 entries)
Equilibrium crosscheck (about global origin)
Fx (N)
Fy (N)
Fz (N)
Mx (N·mm)
My (N·mm)
Mz (N·mm)
ΔF %
ΔM %
Sum of Inputs
Sum of Reactions
Sum / Residual
No pass/fail threshold is applied to ΔF % / ΔM % — they are an independent numerical crosscheck of the solve, provided for review.