We present a model of Newtonian forces and the causal relations they are involved in, applying Röhl & Jansen's model of disposition (extended with a relation between dispositions and their existential conditions), and show that this model fits with the intuition that force is the result of an interaction. We formalize forces as dispositions, dissociating field forces (which have local fields as existential conditions) from composite forces (which encompass contact forces). Finally, we hint at how this model could answer some classical philosophical difficulties concerning forces and dispositions.