diff --git a/src-java/play_clj/g3d_physics/ContactListener.java b/src-java/play_clj/g3d_physics/ContactListener3D.java
similarity index 60%
rename from src-java/play_clj/g3d_physics/ContactListener.java
rename to src-java/play_clj/g3d_physics/ContactListener3D.java
index 40877f2..b51a96c 100644
--- a/src-java/play_clj/g3d_physics/ContactListener.java
+++ b/src-java/play_clj/g3d_physics/ContactListener3D.java
@@ -1,12 +1,12 @@
 package play_clj.g3d_physics;
 
-import com.badlogic.gdx.physics.bullet.collision.btCollisionObject;
 import clojure.lang.IFn;
+import com.badlogic.gdx.physics.bullet.collision.*;
 
-public class ContactListener extends com.badlogic.gdx.physics.bullet.collision.ContactListener {
+public class ContactListener3D extends ContactListener {
 	IFn started, ended;
 	
-	public ContactListener(IFn started, IFn ended) {
+	public ContactListener3D(IFn started, IFn ended) {
 		this.started = started;
 		this.ended = ended;
 	}
diff --git a/src/play_clj/core.clj b/src/play_clj/core.clj
index 5272151..1021a01 100644
--- a/src/play_clj/core.clj
+++ b/src/play_clj/core.clj
@@ -36,7 +36,6 @@
 (load "core_cameras")
 (load "core_graphics")
 (load "core_listeners")
-(load "core_physics")
 (load "core_utils")
 
 (defn ^:private reset-changed!
diff --git a/src/play_clj/g2d_physics.clj b/src/play_clj/g2d_physics.clj
index b71ed3d..c0e9cbd 100644
--- a/src/play_clj/g2d_physics.clj
+++ b/src/play_clj/g2d_physics.clj
@@ -1,6 +1,7 @@
 (ns play-clj.g2d-physics
   (:require [play-clj.core :as c]
             [play-clj.math :as m]
+            [play-clj.physics :as p]
             [play-clj.utils :as u])
   (:import [com.badlogic.gdx.physics.box2d Body BodyDef ChainShape CircleShape
             Contact ContactListener EdgeShape Fixture FixtureDef Joint JointDef
@@ -52,7 +53,7 @@
   `(let [^Body object# (u/get-obj ~entity :body)]
      (u/call! object# ~k ~@options)))
 
-(defmethod c/add-body!
+(defmethod p/add-body!
   World
   [screen b-def]
   (box-2d! screen :create-body b-def))
@@ -69,37 +70,37 @@
   [entity]
   (.getRotation ^Transform (body! entity :get-transform)))
 
-(defmethod c/body-position!
+(defmethod p/body-position!
   Body
   [entity x y angle]
   (body! entity :set-transform x y angle))
 
-(defmethod c/body-x!
+(defmethod p/body-x!
   Body
   [entity x]
-  (c/body-position! entity x (body-y entity) (body-angle entity)))
+  (p/body-position! entity x (body-y entity) (body-angle entity)))
 
-(defmethod c/body-y!
+(defmethod p/body-y!
   Body
   [entity y]
-  (c/body-position! entity (body-x entity) y (body-angle entity)))
+  (p/body-position! entity (body-x entity) y (body-angle entity)))
 
-(defmethod c/body-angle!
+(defmethod p/body-angle!
   Body
   [entity angle]
-  (c/body-position! entity (body-x entity) (body-y entity) angle))
+  (p/body-position! entity (body-x entity) (body-y entity) angle))
 
 (defn ^:private find-body
   [body entities]
   (some #(if (= body (u/get-obj % :body)) %) entities))
 
-(defmethod c/first-entity
+(defmethod p/first-entity
   World
   [screen entities]
   (let [^Contact contact (u/get-obj screen :contact)]
     (-> contact .getFixtureA .getBody (find-body entities))))
 
-(defmethod c/second-entity
+(defmethod p/second-entity
   World
   [screen entities]
   (let [^Contact contact (u/get-obj screen :contact)]
@@ -124,7 +125,7 @@
   [object k & options]
   `(u/call! ^Joint ~object ~k ~@options))
 
-(defmethod c/add-joint!
+(defmethod p/add-joint!
   World
   [screen j-def]
   (box-2d! screen :create-joint j-def))
@@ -240,7 +241,7 @@
                    (not (some #(= (.getBodyB joint) (:body %)) entities)))
           (.destroyJoint world joint))))))
 
-(defmethod c/step!
+(defmethod p/step!
   World
   [{:keys [^World world time-step velocity-iterations position-iterations]
      :or {time-step (/ 1 60) velocity-iterations 10 position-iterations 10}
diff --git a/src/play_clj/g3d_physics.clj b/src/play_clj/g3d_physics.clj
index e086d65..cdcd26e 100644
--- a/src/play_clj/g3d_physics.clj
+++ b/src/play_clj/g3d_physics.clj
@@ -1,6 +1,7 @@
 (ns play-clj.g3d-physics
   (:require [play-clj.core :as c]
             [play-clj.math :as m]
+            [play-clj.physics :as p]
             [play-clj.utils :as u])
   (:import [com.badlogic.gdx.math Matrix4]
            [com.badlogic.gdx.physics.bullet Bullet]
@@ -15,7 +16,7 @@
            [com.badlogic.gdx.physics.bullet.softbody btSoftBody
             btSoftBodyRigidBodyCollisionConfiguration btSoftBodyWorldInfo
             btSoftRigidDynamicsWorld]
-           [play_clj.g3d_physics ContactListener]))
+           [play_clj.g3d_physics ContactListener3D]))
 
 (def ^:private init (delay (Bullet/init)))
 
@@ -124,7 +125,7 @@
   []
   (btSoftBodyWorldInfo.))
 
-(defmethod c/add-body!
+(defmethod p/add-body!
   World3D
   [screen body]
   (cond
@@ -149,7 +150,7 @@
   (let [^btCollisionObject object (:object (u/get-obj entity :body))]
     (-> object .getWorldTransform (. val) (aget Matrix4/M23))))
 
-(defmethod c/body-position!
+(defmethod p/body-position!
   Body3D
   [entity x y z]
   (let [^btCollisionObject object (:object (u/get-obj entity :body))]
@@ -157,32 +158,32 @@
       (doto (m/matrix-4*)
         (m/matrix-4! :set-translation x y z)))))
 
-(defmethod c/body-x!
+(defmethod p/body-x!
   Body3D
   [entity x]
-  (c/body-position! entity x (body-y entity) (body-z entity)))
+  (p/body-position! entity x (body-y entity) (body-z entity)))
 
-(defmethod c/body-y!
+(defmethod p/body-y!
   Body3D
   [entity y]
-  (c/body-position! entity (body-x entity) y (body-z entity)))
+  (p/body-position! entity (body-x entity) y (body-z entity)))
 
-(defmethod c/body-z!
+(defmethod p/body-z!
   Body3D
   [entity z]
-  (c/body-position! entity (body-x entity) (body-y entity) z))
+  (p/body-position! entity (body-x entity) (body-y entity) z))
 
 (defn ^:private find-body
   [body entities]
   (some #(if (= body (:object (u/get-obj % :body))) %) entities))
 
-(defmethod c/first-entity
+(defmethod p/first-entity
   World3D
   [screen entities]
   (-> (u/get-obj screen :first-body)
       (find-body entities)))
 
-(defmethod c/second-entity
+(defmethod p/second-entity
   World3D
   [screen entities]
   (-> (u/get-obj screen :second-body)
@@ -267,7 +268,7 @@
   [screen
    {:keys [on-begin-contact on-end-contact]}
    execute-fn!]
-  (ContactListener.
+  (ContactListener3D.
     (fn [a b]
       (execute-fn! on-begin-contact :first-body a :second-body b))
     (fn [a b]
@@ -304,7 +305,7 @@
           (bullet-3d! screen :remove-soft-body body))
         (.dispose body)))))
 
-(defmethod c/step!
+(defmethod p/step!
   World3D
   [{:keys [delta-time max-sub-steps time-step]
      :or {max-sub-steps 5 time-step (/ 1 60)}
diff --git a/src/play_clj/core_physics.clj b/src/play_clj/physics.clj
similarity index 96%
rename from src/play_clj/core_physics.clj
rename to src/play_clj/physics.clj
index d00ee9d..9347505 100644
--- a/src/play_clj/core_physics.clj
+++ b/src/play_clj/physics.clj
@@ -1,4 +1,5 @@
-(in-ns 'play-clj.core)
+(ns play-clj.physics
+  (:require [play-clj.utils :as u]))
 
 (defmulti step!
   "Runs the physics simulations for a single frame and optionally returns the