diff --git a/Q01-Cálculos/IRigidBody.cs b/Q01-Cálculos/IRigidBody.cs
new file mode 100644
index 0000000..5d73846
--- /dev/null
+++ b/Q01-Cálculos/IRigidBody.cs
@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Numerics;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Q01_Cálculos
+{
+    /// <summary>
+    /// Definimos una interfaz para normalizar clases que representan un cuerpo rígido con masa
+    /// </summary>
+    public interface IRigidBody
+    {
+        public string Name { get; }
+        public float Mass { get; }
+        public Vector3 CenterOfMass { get; }
+        public Vector3 Weight{ get; }
+
+        public int GetChildItemCount(bool Recursive);
+        string Summary(int pad = 0);
+    }
+}