So: all fores are back reactions from the vacuum. The pressure of oscillating vacuum particles (coined Axion/Higgs) is half of all interactions even for gravity. ( Q-FFF Theory)
The Vacuum Pressure of Gravity Back reaction and Inertia Principle ot Q-FFF Theory.
Back reaction is needed for all forces by the pressure of the oscillating Vacuum particles ( called Axion/Higgs). Mass in motion needs a reference frame for its absolute direction in space by its Lorentz polarization. The reference frame is able by particle collision, to point and keep the nose of all propeller shaped fermions into the absolute direction in space. (Lorentz polarization / inertia effect)
By external acceleration the fermion turns the backside of the spinning propeller more into the direction of the back reaction side for more pressure of the vacuum. ( increasing inertia) see also:
see: Emergent Gravity by Dipole Repeller Rigid String Pressure the Origin of Quantum Gravity and Non Inertial Black Holes. https://vixra.org/pdf/1710.0050v1.pdf
Text: "Thus as with the Casimir force, a zero-point field quantum vacuum effect is proposed to give rise to a macroscopic phenomenon: in this case, the inertia of matter. "
The explanation of the back reaction of gravity and Inertia by the Lorentz Polarization of propeller fermions.see below and: also : THE ZERO-POINT FIELD AND INERTIA. By B. Haisch and A. Rueda. https://arxiv.org/pdf/gr-qc/9908057.pdf