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We propose a one-channel, simple model to describe the dynamics of ultracolddipolar molecules around a F\"orster resonance. Slightly above a specificelectric field, a collisional shielding can take place, suppressing themolecular losses in a gas. The overall description of the quantum physicalmechanism comes back to the dynamics on a unique energy surface, which dependson the relative distance and angular approach of the molecules. This surfaceenables to interpret how the dipole moments of the molecules are induced andinterlocked by the electric field and the dipole-dipole interaction during theprocess, especially when the shielding is triggered. Averaging the relativeangular motion over a unique partial wave (the lowest one when the ultracoldregime is reached), the model reproduces well the behaviour of the ratecoefficients observed experimentally and predicted theoretically [Matsuda etal., Science 370, 1324 (2020); Li et al., Nat. Phys. 17, 1144 (2021)]. Thiseconomic model encapsulates the main physics of the quantum process. Therefore,it can be used as an alternative to a full quantum dynamical treatment and ispromising for future studies of collisions involving more bodies.

Model for two-body collisions between ultracold dipolar molecules around a F\"orster resonance in an electric field