diff --git a/include/ball.hpp b/include/ball.hpp
index 7d73e60..be52241 100644
--- a/include/ball.hpp
+++ b/include/ball.hpp
@@ -16,9 +16,6 @@ protected:
      */
     virtual sf::Vector2f getForces(EngineState& state);
 
-    static constexpr float ATTRACTION = 25000;
-    static constexpr float MOVE = 100;
-
 public:
     Ball(float x, float y);
 
diff --git a/include/block.hpp b/include/block.hpp
index 35d417e..11a433c 100644
--- a/include/block.hpp
+++ b/include/block.hpp
@@ -12,8 +12,6 @@ protected:
     sf::RectangleShape shape;
 
 public:
-    static constexpr float GRID = 32;
-
     Block(float x, float y);
 
     /**
diff --git a/include/constants.hpp b/include/constants.hpp
new file mode 100644
index 0000000..6b550cd
--- /dev/null
+++ b/include/constants.hpp
@@ -0,0 +1,33 @@
+#ifndef __PTF_CONSTANTS_HPP__
+#define __PTF_CONSTANTS_HPP__
+
+namespace Constants {
+    /**
+     * Constante d'attraction. Utilisée dans la formule
+     * pour le calcul de l'attraction coulombienne entre
+     * deux objets
+     */
+    static constexpr float ATTRACTION = 25000;
+
+    /**
+     * Constante de déplacement. Définit la quantité de
+     * mouvement qui est donnée à un objet lorsqu'il
+     * est manipulé manuellement par le joueur
+     */
+    static constexpr float MOVE = 100;
+
+    /**
+     * Constante de gravité. Utilisée dans la formule
+     * pour calculer la force de gravité appliquée
+     * uniformément vers le bas de la fenêtre sur tous
+     * les objets
+     */
+    static constexpr float GRAVITY = 20;
+
+    /**
+     * Taille de la grille des blocs en pixels
+     */
+    static constexpr float GRID = 32;
+}
+
+#endif
diff --git a/include/physics_object.hpp b/include/physics_object.hpp
index 34e778a..0488965 100644
--- a/include/physics_object.hpp
+++ b/include/physics_object.hpp
@@ -19,8 +19,6 @@ protected:
      */
     virtual sf::Vector2f getForces(EngineState& state);
 
-    static constexpr float GRAVITY = 20;
-
 public:
     PhysicsObject(float x, float y);
 
diff --git a/src/ball.cpp b/src/ball.cpp
index 5217195..9f2a379 100644
--- a/src/ball.cpp
+++ b/src/ball.cpp
@@ -1,4 +1,5 @@
 #include "ball.hpp"
+#include "constants.hpp"
 
 Ball::Ball(float x, float y) : PhysicsObject(x, y), shape(10 * mass) {
     shape.setOrigin(sf::Vector2f(10 * mass, 10 * mass));
@@ -35,11 +36,11 @@ sf::Vector2f Ball::getForces(EngineState& state) {
 
     // déplacement de la balle après appui sur les touches de direction
     if (state.keys[sf::Keyboard::Left]) {
-        forces += sf::Vector2f(-Ball::MOVE, 0);
+        forces += sf::Vector2f(-Constants::MOVE, 0);
     }
 
     if (state.keys[sf::Keyboard::Right]) {
-        forces += sf::Vector2f(Ball::MOVE, 0);
+        forces += sf::Vector2f(Constants::MOVE, 0);
     }
 
     // force d'attraction entre les balles et les blocs chargés
@@ -66,7 +67,7 @@ sf::Vector2f Ball::getForces(EngineState& state) {
             // normalisation du vecteur direction qui porte
             // la force d'attraction, puis application de la norme
             attraction /= std::sqrt(distanceSquared);
-            attraction *= Ball::ATTRACTION * (
+            attraction *= Constants::ATTRACTION * (
                 (charge * attractive->getCharge()) /
                 distanceSquared
             );
diff --git a/src/block.cpp b/src/block.cpp
index 2fbc918..2da0fde 100644
--- a/src/block.cpp
+++ b/src/block.cpp
@@ -1,7 +1,8 @@
 #include "block.hpp"
+#include "constants.hpp"
 
-Block::Block(float x, float y) : Object(x, y), shape(sf::Vector2f(Block::GRID, Block::GRID)) {
-    shape.setOrigin(sf::Vector2f(Block::GRID / 2, Block::GRID / 2));
+Block::Block(float x, float y) : Object(x, y), shape(sf::Vector2f(Constants::GRID, Constants::GRID)) {
+    shape.setOrigin(sf::Vector2f(Constants::GRID / 2, Constants::GRID / 2));
 }
 
 void Block::draw(sf::RenderWindow& window) {
@@ -30,9 +31,9 @@ void Block::update(EngineState& state) {
 
 std::unique_ptr<sf::FloatRect> Block::getAABB() {
     return std::unique_ptr<sf::FloatRect>(new sf::FloatRect(
-        position.x - Block::GRID / 2,
-        position.y - Block::GRID / 2,
-        Block::GRID, Block::GRID
+        position.x - Constants::GRID / 2,
+        position.y - Constants::GRID / 2,
+        Constants::GRID, Constants::GRID
     ));
 }
 
diff --git a/src/main.cpp b/src/main.cpp
index f90efbc..19bf608 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,23 +1,24 @@
 #include "ball.hpp"
 #include "block.hpp"
 #include "engine.hpp"
+#include "constants.hpp"
 #include <iostream>
 
 int main() {
     Engine engine;
 
-    Ball ball1(5 * Block::GRID, 1 * Block::GRID);
-    Ball ball2(7 * Block::GRID, 1 * Block::GRID);
+    Ball ball1(5 * Constants::GRID, 1 * Constants::GRID);
+    Ball ball2(7 * Constants::GRID, 1 * Constants::GRID);
 
-    Block block1(2 * Block::GRID, 7 * Block::GRID);
-    Block block2(3 * Block::GRID, 7 * Block::GRID);
-    Block block3(4 * Block::GRID, 7 * Block::GRID);
-    Block block4(5 * Block::GRID, 7 * Block::GRID);
-    Block block5(6 * Block::GRID, 7 * Block::GRID);
-    Block block6(7 * Block::GRID, 7 * Block::GRID);
-    Block block7(8 * Block::GRID, 7 * Block::GRID);
-    Block block8(9 * Block::GRID, 7 * Block::GRID);
-    Block block9(10 * Block::GRID, 7 * Block::GRID);
+    Block block1(2 * Constants::GRID, 7 * Constants::GRID);
+    Block block2(3 * Constants::GRID, 7 * Constants::GRID);
+    Block block3(4 * Constants::GRID, 7 * Constants::GRID);
+    Block block4(5 * Constants::GRID, 7 * Constants::GRID);
+    Block block5(6 * Constants::GRID, 7 * Constants::GRID);
+    Block block6(7 * Constants::GRID, 7 * Constants::GRID);
+    Block block7(8 * Constants::GRID, 7 * Constants::GRID);
+    Block block8(9 * Constants::GRID, 7 * Constants::GRID);
+    Block block9(10 * Constants::GRID, 7 * Constants::GRID);
 
     ball1.setCharge(-2);
     ball2.setCharge(-2);
diff --git a/src/physics_object.cpp b/src/physics_object.cpp
index 7a43c0c..63a1586 100644
--- a/src/physics_object.cpp
+++ b/src/physics_object.cpp
@@ -1,4 +1,5 @@
 #include "physics_object.hpp"
+#include "constants.hpp"
 
 PhysicsObject::PhysicsObject(float x, float y) :
     Object(x, y), mass(1), accelLine(sf::LinesStrip, 2),
@@ -32,7 +33,7 @@ sf::Vector2f PhysicsObject::getForces(EngineState& state) {
     sf::Vector2f forces(0, 0);
 
     // force de gravité
-    forces += sf::Vector2f(0, PhysicsObject::GRAVITY);
+    forces += sf::Vector2f(0, Constants::GRAVITY);
 
     return forces;
 }