code:

string $pushObject = "MAIN_LOCATOR"; //name of the influence transform
string $moveGroup = "moveGroup";    //name of the group with the objects you want to move
float $range2 = 10.0;                //influence range

string $ddNodeName;
float $restPos[];
string $object;
string $objectList[] = `listRelatives -children -type transform $moveGroup`;

for($object in $objectList)
{
	//create measure node
	$ddNodeName = `createNode -n ($object+"_dd") distanceDimShape`;
	setAttr ($ddNodeName+".visibility") 0;

	//connect measure node to locator and objects starting position
	connectAttr -f ($pushObject+".translate") ($ddNodeName+".startPoint");
	$restPos = `xform -q -ws -t $object`;
	setAttr -type float3 ($ddNodeName+".endPoint") $restPos[0] $restPos[1] $restPos[2];
	

	if ( (getAttr ($pushObject+".translateZ")) >= (getAttr ($object+".translateZ")) ){
         if ( (getAttr ($ddNodeName+".distance")) <= $range2 ) {
          float $frame = `currentTime -q`;
          setKeyframe -time $frame -v 0 -at rotateZ;
          setKeyframe -time ($frame+20) -v 90 -at rotateZ;
         }
        }
}