With GUI's you can use TweenSize and TweenPosition to move or change a gui smoothly. I wanted to find out if there is such a way to do the same smoooth transition on a part like the gui. Can you use the TweenSize on a part too??
You can, actually. Check out this model I made forever ago:
http://www.roblox.com/Part-Tweening-Function-item?id=78813197
You just get some GUI elements, tween those, and then map the position of the gui element to a part every time it moves.
No. TweenSize uses UDim2 for its measurements, where as Parts use Vector3's.
The closest way to "replicate" this kind of action would be a for statement. Such as;
for i=1,5 do -- Change position +1 script end