diff --git a/include/physics_engine.h b/include/physics_engine.h
index bcd4853..3bc092e 100644
--- a/include/physics_engine.h
+++ b/include/physics_engine.h
@@ -4,6 +4,7 @@
 #include <vector>
 #include <SFML/Graphics.hpp>
 #include "physics_object.h"
+#include "physics_circle.h"
 
 class PhysicsEngine{
 private:
@@ -12,9 +13,9 @@ class PhysicsEngine{
   static bool(*collisionTable)(PhysicsObject*, PhysicsObject*) [4][4];
 
 public:
-  void addObject(std::unique_ptr<PhysicsObject> obj);
-
-  
+  void addCircle(float radius, ShapeID ID,
+  sf::Vector2f pos, sf::Vector2f vel, sf::Vector2f acc,
+  float angle, float ang_acc, float ang_vel, PhysicalAttributes attr, bool isStatic);
   void update(sf::Time dt);
   void draw(sf::RenderWindow& window);
 };
diff --git a/include/physics_engine.h~ b/include/physics_engine.h~
new file mode 100644
index 0000000..e69de29
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..038d624
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,23 @@
+#include <iostream>
+#include <SFML/System.hpp>
+using namespace std;
+
+void func() {
+  for (int i = 0; i < 10; i++) {
+    cout << "Thread 1" << endl;
+  }
+}
+
+int main() {
+  sf::Thread thread1(&func), thread2(&func);
+  thread1.launch();
+  thread2.launch();
+
+  for(int i = 0; i < 10; i++) {
+    cout << "Main thread" << endl;
+  }
+
+  return 0;
+}
+  
+		      
diff --git a/main.cpp~ b/main.cpp~
new file mode 100644
index 0000000..9ad31e8
--- /dev/null
+++ b/main.cpp~
@@ -0,0 +1,27 @@
+#include <iostream>
+#include <SFML/System.hpp>
+using namespace std;
+
+void func() {
+  for (int i = 0; i < 10; i++) {
+    cout << "Thread 1" << endl;
+  }
+}
+
+int main() {
+  sf::Thread thread(&func);
+  // wait
+
+  //wait
+
+  //wait
+  thread.launch();
+
+  for(int i = 0; i < 10; i++) {
+    cout << "Main thread" << endl;
+  }
+
+  return 0;
+}
+  
+		      
diff --git a/sfml-app b/sfml-app
new file mode 100755
index 0000000..3e69497
Binary files /dev/null and b/sfml-app differ
diff --git a/src/physics_engine.cpp b/src/physics_engine.cpp
index 9394463..0e56828 100644
--- a/src/physics_engine.cpp
+++ b/src/physics_engine.cpp
@@ -33,7 +33,20 @@ namespace{
 
 *PhysicsEngine::collisionTable[0][0] = circlecircleCollision;
 
-void PhysicsEngine::addObject(std::unique_ptr<PhysicsObject> obj) {
+void PhysicsEngine::addCircle(float radius, ShapeID ID,
+  sf::Vector2f pos, sf::Vector2f vel, sf::Vector2f acc,
+  float angle, float ang_acc, float ang_vel, const PhysicalAttributes &attr, bool isStatic) {
+  std::unique_ptr<Circle> obj = new Circle(radius, pos);
+
+  obj->setPosition(pos);
+  obj->setVelocity(vel);
+  obj->setAcceleration(acc);
+  obj->setAngle(angle);
+  obj->setAngularAcceleration(ang_acc);
+  obj->setAngularVelocity(ang_vel);
+  obj->setAttributes(attr);
+  obj->setIsStatic(isStatic);
+
   objects.push_back(std::move(obj));
 }
 
@@ -54,5 +67,6 @@ void PhysicsEngine::draw(sf::RenderWindow& window) {
   for (auto& obj : objects) 
     obj->draw(window);
 }
+