Few player moving questions (Sphere rolling)

All these are just for a little mini project I’m doing but having a little trouble with.

  1. I’m trying to have a sphere roll down an incline and increase its speed as time goes by ( without hitting an obstruction).
  2. And since it is moving down the incline how would I make it be able to move left and right but not up and down.

I had 2. working fine before trying to add speed but now the ball will just slowly creep to the left/right, and I want to make this much faster and seemless

If you mean adding speed by momentum then you will use a script calling for increased speed * force velocity to the rigid body. So its like what is shown here under the addforce part.

and to simply add the left/right movement without forward/backward, you can use something like this and just not code the part with that specific direction.