@qeeb said:

i have a problem with sketchy physics...
i have imported a race track from 3D google warehouse and also a motorbike from the same source...
when the animation is put to play , then all the objects will drop...
i have put the track to static and frozen but still the motorbike will drop down vertically downwards to nowhere... i need help!!!

Are you using Sketchups built in 3dwarehouse get model menu? Is so that wont work unless you "explode" the model first. For best results download the model by using your web browser.