Can anyone help with an ongoing argument we are having. When a particle interacts with a vector field e.g. the electric field, it experiences a force trying to move it which depends on the particle charge and the local field condition, - but when it interacts with a scalar field e.g. the Higs field, it just gets a return value ,- no movement - the contention is that whilst it is interacting with the scalar field it cannot move, movement is only allowed with vector fields. This could be the start of an explanation for inertial mass!