// Set variables as zero
fMov = 0;
aDrag = 0;
gDrag = 0;
totalF = 0;

function moveStuff() {
    //Get values from text fields
fMov = fmov.text;
aDrag = adrag.text;
gDrag = gdrag.text;

// Calculate total force
totalF = fMov - ( aDrag + gDrag );
// Show total force
totalf.text = totalF;
if ( totalF > 0 )
{
// if total force is greater than zero, rotate rectangle
rect._rotation += totalF;
}
}
rect.onEnterFrame = moveStuff;



/// Result table. Not part of code
gDrag     aDrag     fMov     total   rotates
1          0        100       99     yes
1         10        10       -1      no
1         3         50        19     yes (very fast)