Gravity and sloping

[COLOR=black][FONT=Arial]Hi Every one [/FONT][/COLOR]
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[COLOR=black][FONT=Arial]I want to do gravity effect on a ball . I found some thing do this[/FONT][/COLOR]
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[COLOR=black][FONT=Arial]but I need to make the ball goes to the floor direction [/FONT][/COLOR]
[COLOR=black][FONT=Arial]actually I want it to follow the sloping of the floor with the gravity effect [/FONT][/COLOR]
[COLOR=black][FONT=Arial]I have an example check the attachments[/FONT][/COLOR]
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[COLOR=black][FONT=Arial]See this picture here [/FONT][/COLOR]
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[COLOR=black][FONT=Arial]regards[/FONT][/COLOR]