// car body
var carDef:b2PolygonDef = new b2PolygonDef();
carDef.SetAsOrientedBox(20, 20, new b2Vec2(0, 0), 0);
carDef.friction = .5;
carDef.density = .5;
carDef.restitution=0;
var carBodyDef:b2BodyDef = new b2BodyDef();
carBodyDef.position.Set(110,250);
var carBody = m_world.CreateBody(carBodyDef);
carBody.CreateShape(carDef)
carBody.SetMassFromShapes();

//===========================
// Motor Example
// A simple motor example
//===========================
pivot.position.Set(80,250);
var pivotBody1:b2Body = m_world.CreateBody(pivot);
pivotBody1.CreateShape(pivotPoly)
pivotBody1.SetMassFromShapes();

var motorPoly:b2PolygonDef = new b2PolygonDef();
motorPoly.SetAsOrientedBox(30, 10, new b2Vec2(0, 0), 0);
motorPoly.friction = .3;
motorPoly.density = .01;
motorPoly.restitution = .1;

var motorDef:b2BodyDef = new b2BodyDef();
motorDef.position.Set(110, 250);
var motorBody:b2Body = m_world.CreateBody(motorDef);
motorBody.CreateShape(motorPoly);
motorBody.CreateShape(carDef);
motorBody.SetMassFromShapes();

//Setup the revolute joint definition for later instantiation. rjd is a predefined b2RevoluteJointDef object.
rjd.Initialize(carBody, motorBody, new b2Vec2(80,250));
rjd.motorSpeed = -3;
rjd.maxMotorTorque = 10000000;
rjd.enableMotor = true;
rjd.enableLimit = false;
//Create the motor joint and cast it as a b2RevoluteJoint
var joint1:b2RevoluteJoint = m_world.CreateJoint(rjd) as b2RevoluteJoint;