Создание динамического тела с помощью cocos 2d js и Chipmunk

Ну вот:

//Add the Chipmunk Physics space
var space = new cp.Space();
space.gravity = cp.v(0, -10);

//Optionally add the debug layer that shows the shapes in the space moving:
/*var debugNode = new cc.PhysicsDebugNode(space);
debugNode.visible = true;
this.addChild(debugNode);*/

//add a floor:
var floor = new cp.SegmentShape(this.space.staticBody, cp.v(-1000, 10), cp.v(1000, 0), 10);
//floor.setElasticity(1);
//floor.setFriction(0);
space.addStaticShape(floor);

//add a square to bounce
//the Sprite
var mySprite = cc.PhysicsSprite.create("res/something.png");
gameLayer.addChild(mySprite);

//the Body
var size = mySprite.getContentSize();
var innertialMomentum = 1; //Use Infinity if you want to avoid the body from rotating
var myBody = new cp.Body(innertialMomentum , cp.momentForBox(innertialMomentum , size.width, size.height));
mySprite.setBody(myBody);
space.addBody(myBody);
//myBody.p = cc.p(xxx, yyy); //To alter the position of the sprite you have to manipulate the body directly, otherwise it won't have the desired effect. You can also access it by mySprite.body

//the Shape
var myShape = new cp.BoxShape(myBody, size.width, size.height);
//myShape.setElasticity(1);
//myShape.setFriction(0);
space.addShape(myShape);

//Apply your desired impulse
//mySprite.body.applyImpulse(cp.v(ix,iy), cp.v(rx,ry)); // Where the first vector is for the impulse strength and direction and the second is for the offset between the center of the object and where you want the impulse to be applied.