diff --git a/Code/GamePhysics/Implementation/SimpleRigidBody.cpp b/Code/GamePhysics/Implementation/SimpleRigidBody.cpp
index 70bc6938..ea75ffe3 100644
--- a/Code/GamePhysics/Implementation/SimpleRigidBody.cpp
+++ b/Code/GamePhysics/Implementation/SimpleRigidBody.cpp
@@ -177,4 +177,9 @@ void SimpleRigidBody::SetOrientation( const Float4x4 &orientation )
 void SimpleRigidBody::SetSize( const Float3 &size )
 {
 	this->rigid.SetSize( size );
+}
+
+void SimpleRigidBody::SetMomentum( const Float3 &worldG )
+{
+	this->rigid.SetLinearMomentum( worldG );
 }
\ No newline at end of file
diff --git a/Code/GamePhysics/Implementation/SimpleRigidBody.h b/Code/GamePhysics/Implementation/SimpleRigidBody.h
index a674a20d..5e05c9d7 100644
--- a/Code/GamePhysics/Implementation/SimpleRigidBody.h
+++ b/Code/GamePhysics/Implementation/SimpleRigidBody.h
@@ -41,6 +41,7 @@ namespace Oyster { namespace Physics
 		void SetRotation( const ::Oyster::Math::Float4x4 &rotation );
 		void SetOrientation( const ::Oyster::Math::Float4x4 &orientation );
 		void SetSize( const ::Oyster::Math::Float3 &size );
+		void SetMomentum( const ::Oyster::Math::Float3 &worldG );
 
 	private:
 		::Oyster::Physics3D::RigidBody rigid;
diff --git a/Code/GamePhysics/Implementation/SphericalRigidBody.cpp b/Code/GamePhysics/Implementation/SphericalRigidBody.cpp
index c741a68a..03ed7d2a 100644
--- a/Code/GamePhysics/Implementation/SphericalRigidBody.cpp
+++ b/Code/GamePhysics/Implementation/SphericalRigidBody.cpp
@@ -183,4 +183,9 @@ void SphericalRigidBody::SetSize( const Float3 &size )
 {
 	this->rigid.SetSize( size );
 	this->body.radius = 0.5f * Min( Min( size.x, size.y ), size.z ); // inline Min( FloatN )?
+}
+
+void SphericalRigidBody::SetMomentum( const Float3 &worldG )
+{
+	this->rigid.SetLinearMomentum( worldG );
 }
\ No newline at end of file
diff --git a/Code/GamePhysics/Implementation/SphericalRigidBody.h b/Code/GamePhysics/Implementation/SphericalRigidBody.h
index 37263e91..a25cba2c 100644
--- a/Code/GamePhysics/Implementation/SphericalRigidBody.h
+++ b/Code/GamePhysics/Implementation/SphericalRigidBody.h
@@ -42,6 +42,7 @@ namespace Oyster { namespace Physics
 		void SetRotation( const ::Oyster::Math::Float4x4 &rotation );
 		void SetOrientation( const ::Oyster::Math::Float4x4 &orientation );
 		void SetSize( const ::Oyster::Math::Float3 &size );
+		void SetMomentum( const ::Oyster::Math::Float3 &worldG );
 
 	private:
 		::Oyster::Physics3D::RigidBody rigid;
diff --git a/Code/GamePhysics/PhysicsAPI.h b/Code/GamePhysics/PhysicsAPI.h
index 29014214..56e46817 100644
--- a/Code/GamePhysics/PhysicsAPI.h
+++ b/Code/GamePhysics/PhysicsAPI.h
@@ -390,6 +390,12 @@ namespace Oyster
 			 * Use API::SetSize(...)
 			 ********************************************************/
 			virtual void SetSize( const ::Oyster::Math::Float3 &size ) = 0;
+
+			/********************************************************
+			 * To not be called if is in Engine
+			 * Use API::?? @todo TODO: 
+			 ********************************************************/
+			virtual void SetMomentum( const ::Oyster::Math::Float3 &worldG ) = 0;
 		};
 
 		struct API::SimpleBodyDescription