I want to do a rolling ball track creator with physics, can someone help? I want the ball to be blue and the track to be black. Thanks.

Can you define more precisely what you want to do ? Because I'm not sure I understand.

Do you want to really simulate a real ball on a real track? There are a bunch of factors to this:

Initial push - Effect depends on how long and how hard
Gravity - Effect depends on angle of the track and its length
Linear Inertia - Depends on the mass and speed of the ball.
Rotational Inertia - This is about the ball rolling rather than skidding, it depends on the size of the ball and its mass and if it's solid or hollow.
Air Resistance - depends on the size of the ball and its speed.
Rolling resistance - mostly just depends on the track and ball material

I'd suggest you go for it and use all the factors, but it depends on how much physics you know/want to learn.

I just want to start with a simple ball drop, and the user can go on as they please. And it's in Scratch, not in real life. Oh, and I want to use pieces that the user can rotate. I'm thinking of using sliders for that.

Is it anything like this: http://scratch.mit.edu/projects/12232251/

Yeah, but the physics are kinda basic. I want to have just regular physics here, not 8-bit. No offense.

Well that's done! now all I need is to make pieces for it. anyone got a sprite pack for that?