Force Diagram Builder
Interactive simulation — adjust parameters and watch the visualization update in real time.
How it works
Add up to four forces on a single object. Each force has a magnitude (newtons) and an angle measured from the +x axis counterclockwise — 0° points right, 90° points up. Colored arrows are the forces you enable; the thick cyan arrow is the net force ΣF. The dashed magenta arrow is acceleration a = ΣF/m (same direction as ΣF; length is scaled for visibility). The diagram redraws every frame as you move the sliders.
Key equations
F_x = |F| cos θ, F_y = |F| sin θ
ΣF = Σ F_i (vector sum)
a = ΣF / m