Thanks for the help Mats, its cleared up some issues for me.
I'm still having problems with it, the mass isn't sliding and instead its rotating with the block as if it is fixed to it. I have set one translation starting plane to 0mm and the other translational stating point to 100mm (with regeneration on). I have then turned on the roatioanl cnostraint and enabled friction giving static friction of 0.74 and kinetic friction of 0.6.
It could be the way I'm running my analysis? When I open my mechanism analysis I leave the type on "position", however this greys out "Ext. Loads" which I notice if you set type to "Dynamic" you can enable friction and gravity?
Thanks again
Cameron
P.s. I have attached my assembly to this post. I use Creo 2.0.