Is it to do with the atomic structure or something similar, or am I completely along the wrong lines?
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If there is energy in motion, to move any object that energy has to be transferred to that object, meaning work has do be done / a force has to act on that object for a certain amount time/length. Conservation of energy dictates that no object can just suddenly have more energy without it being transferred from somewhere else, so something has to act on that object to make it move (=it has to have a certain inertia), and as the energy in motion is proportional to the objects mass, the change in motion is inversely proportional to that mass for a given force (= a more massive object ‘resists’ change in motion more/has more inertia).
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