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diff --git a/src/main/scala/sims/collision/CircleCollision.scala b/src/main/scala/sims/collision/CircleCollision.scala
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+++ b/src/main/scala/sims/collision/CircleCollision.scala
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+/*
+ * Simple Mechanics Simulator (SiMS)
+ * copyright (c) 2009 Jakob Odersky
+ * made available under the MIT License
+*/
+
+package sims.collision
+
+import sims.geometry._
+import sims.dynamics._
+
+/**Collision between two circles.*/
+case class CircleCollision(c1: Circle, c2: Circle) extends Collision {
+  val shape1 = c1
+  val shape2 = c2
+  val normal = (c2.pos - c1.pos).unit
+  val points = {
+    val distance = (c2.pos - c1.pos).length
+    val p = shape1.pos + normal * (distance - c2.radius)
+    List(p)
+  } 
+}