The LiquidFun programmer guide says the following:
“LiquidFun is tuned for MKS units. Keep the size of moving objects roughly between 0.1 and 10 meters. You’ll need to use some scaling system when you render your environment and actors. The LiquidFun testbed does this by using an OpenGL viewport transform. DO NOT USE PIXELS.”
The Corona tutorial appears to use pixels (at least, a rectangle of size 64x128 is created). Is there some Corona-specific scaling going on or some other way to address this?