Assuming the fingers are in contact to push or pull the object, the amount of pressure put on the fingers to move an object would increase with the weight of the object. This results because friction force that must be overcome to push or pull the object is proportional to the object's weight. [Elementary physics.]And the print definition varies with the pressure used to implant the fingerprint. If the fingers are not pressed hard enough against the object, some of the print will be missing from the object. If they are pressed too hard, the print will be smudged and ill-defined. And that's the answer.Fingerprints are likely to be smudged with moving heavy objects, missing in part with moving light objects, and better defined when moving medium weight objects. All this assumes we're using the fingers in all cases. In fact, we'd probably use the palms of our hands if we are moving heavy objects; so the fingers might not even touch the object.