commence physics implementation with mass

src/Classes/Physics/Mass.hs

@@ -0,0 +1,11 @@
+module Classes.Physics.Mass where
+
+-- | This typeclass is a centerpiece of the physics implementation and is used
+-- to implement the basic mass properties of a (very simplified) physical body.
+class Mass m where
+
+  -- | The mass of the object
+  mass :: m -> Double
+
+  -- | The scaling factor for how much this object is affected by gravity.
+  gravScale :: m -> Double