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2 changes: 1 addition & 1 deletion README.md
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This module implements a [velocity Verlet](https://en.wikipedia.org/wiki/Verlet_integration) numerical integrator for simulating physical forces on particles. The simulation is simplified: it assumes a constant unit time step Δ*t* = 1 for each step, and a constant unit mass *m* = 1 for all particles. As a result, a force *F* acting on a particle is equivalent to a constant acceleration *a* over the time interval Δ*t*, and can be simulated simply by adding to the particle’s velocity, which is then added to the particle’s position.

In the domain of information visualization, physical simulations are useful for studying [networks](https://observablehq.com/@d3/force-directed-graph) and [hierarchies](https://observablehq.com/@d3/force-directed-tree)!
In the domain of information visualization, physical simulations are useful for studying [networks](https://observablehq.com/@d3/force-directed-graph/2) and [hierarchies](https://observablehq.com/@d3/force-directed-tree)!

[<img alt="Force-Directed Graph" src="https://raw.githubusercontent.com/d3/d3-force/master/img/graph.png" width="420" height="219">](https://observablehq.com/@d3/force-directed-graph)[<img alt="Force-Directed Tree" src="https://raw.githubusercontent.com/d3/d3-force/master/img/tree.png" width="420" height="219">](https://observablehq.com/@d3/force-directed-tree)

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