The difference is only in acceleration but it is still following F=ma principle. Consider fan. It can be rotated by Lorentz Force. The fan also can be rotated by a mechanical force. Consider gravitational force also as a mechanical force. So, the effect of Lorentz Force or mechanical force(gravity) on a fan remains same. Electricity also can be generated from Gravity; as is done in Hydel Power Projects. That is OK. I am not saying \(m=q\). But my speculation is that, \(m\) can be co-related with the spin of a particle. ie more the spin, more the mass.