diff --git a/enginecustom/applicationclass.cpp b/enginecustom/applicationclass.cpp
index 56c669a..812f6c9 100644
--- a/enginecustom/applicationclass.cpp
+++ b/enginecustom/applicationclass.cpp
@@ -397,6 +397,13 @@ bool ApplicationClass::Initialize(int screenWidth, int screenHeight, HWND hwnd)
 
 void ApplicationClass::Shutdown()
 {
+	// Release the physics object.
+	if (m_Physics)
+	{
+		delete m_Physics;
+		m_Physics = 0;
+	}
+
 	// Release the frustum class object.
 	if (m_Frustum)
 	{
@@ -723,10 +730,16 @@ bool ApplicationClass::Frame(InputClass* Input)
 
 	for (auto object : m_object)
 	{
-		m_Physics->ApplyGravity(object, frameTime);
-		if (XMVectorGetY(object->GetPosition()) < -10.0f)
+		if (object != nullptr) // Vérifie que l'objet n'est pas nullptr
 		{
-			object->SetPosition(XMVectorSet(0.0f, 20.0f, 0.0f, 0.0f));
+			m_Physics->ApplyGravity(object, frameTime);
+			if (XMVectorGetY(object->GetPosition()) < -10.0f)
+			{
+				// Obtenez la position actuelle de l'objet
+				XMVECTOR currentPosition = object->GetPosition();
+				// Définissez la nouvelle position y tout en conservant les positions x et z actuelles
+				object->SetPosition(XMVectorSetY(currentPosition, 20.0f));
+			}
 		}
 	}
 	
diff --git a/enginecustom/physics.cpp b/enginecustom/physics.cpp
index 3e7eff7..def234b 100644
--- a/enginecustom/physics.cpp
+++ b/enginecustom/physics.cpp
@@ -1,32 +1,42 @@
 #include "physics.h"
 
+
 Physics::Physics()
 {
-	m_gravity = -9.81f;
+	m_gravity = -9.81f; // Initilize the gravity value
 }
 
-
 Physics::Physics(const Physics& other)
 {
-	m_gravity = other.m_gravity; // Copy gravity value from the other object
+	m_gravity = other.m_gravity; // Copy the gravity value
 }
 
-
 Physics::~Physics()
 {
 }
 
-float Physics::GetGravity() // Changed the method to return the gravity value
+// Get the gravity value
+float Physics::GetGravity()
 {
 	return m_gravity;
 }
 
+// Define the gravity value
+void Physics::SetGravity(float gravity)
+{
+	m_gravity = gravity;
+}
+
+// Apply gravity to an object
 void Physics::ApplyGravity(Object* object, float frameTime)
 {
-	// Update the position of the object by adding the change in position due to gravity.
-	XMVECTOR position = object->GetPosition(); // Get the current position
-	position = XMVectorSetY(position, XMVectorGetY(position) + m_gravity * frameTime); // Update the y value
-	object->SetPosition(position); // Set the updated position
+	if (object == nullptr) // Verify if the object is not null
+	{
+		return;
+	}
 
-	return;
+	// Update the object position
+	XMVECTOR position = object->GetPosition();
+	position = XMVectorSetY(position, XMVectorGetY(position) + m_gravity * frameTime); // Update the Y position
+	object->SetPosition(position);
 }
\ No newline at end of file
diff --git a/enginecustom/physics.h b/enginecustom/physics.h
index cfe9153..125846d 100644
--- a/enginecustom/physics.h
+++ b/enginecustom/physics.h
@@ -3,20 +3,19 @@
 
 #include "object.h"
 
-class Physics
+class Physics : public Object
 {
 public:
-    public:
     Physics();
-    Physics(const Physics&);
+    explicit Physics(const Physics&); // Use explicit to avoid implicit conversion
     ~Physics();
 
-    float GetGravity();
-    void ApplyGravity(Object*, float);
+    float GetGravity(); // Get the gravity value
+    void SetGravity(float gravity); // Define the gravity value
+    void ApplyGravity(Object*, float); // Apply gravity to an object
 
 private:
     float m_gravity;
 };
 
-#endif
-
+#endif
\ No newline at end of file