Free Body Diagram Maker — Free Online Tool

A free body diagram isolates one object or system and replaces each external interaction with a labeled force vector. It shows which forces act, where they point, and optionally how large they are, providing the model needed before applying Newton's laws, equilibrium equations, or component calculations.

Include only external forces acting on the isolated object, such as weight, normal force, friction, tension, drag, spring force, or an applied push. Exclude velocity, acceleration, motion paths, and the reaction force acting on another body unless that body belongs inside the selected system boundary.

Set the incline angle, draw weight vertically downward, and place the normal force perpendicular to the surface. Add friction opposite the relative motion tendency and include tension or applied forces when present. Turn on component lines to verify directions along your chosen horizontal–vertical or incline-aligned axes.

The maker resolves every vector with Fx = F cos θ and Fy = F sin θ, then sums the x and y components. It calculates the resultant magnitude and direction from those sums. With a positive mass, the Equation Lab also shows ax = ΣFx/m, ay = ΣFy/m, and resultant acceleration.

Use scaled arrows when the diagram should communicate relative force magnitude at a glance. Use equal-length arrows for conceptual lessons where readable labels and directions matter more than visual proportion. The numerical magnitude, component table, and equation results remain authoritative in either display mode.

Zero net force means the vector sum is within the equilibrium tolerance, so acceleration is zero in an inertial frame. It does not prove the object is stationary; the object may remain at rest or continue moving at constant velocity. Always interpret the FBD together with the stated motion conditions.

Download SVG when you need a sharp vector diagram that can be resized or edited in compatible presentation software. Download PNG for quick insertion into Word, learning platforms, and homework submissions. Both exports use the same labels, vectors, and calculation-backed diagram shown in the live preview.

This body diagram maker creates physics free-body diagrams: labeled force vectors acting on one isolated object or system. It is not an anatomy diagram, body-shape visualizer, workout chart, or pose-reference tool. The page focuses on mechanics, force components, equilibrium, and Newton's second law.