I am developing physics based game using box2d in cocos2d-iphone. Can any one please help me in creating magnetic coin effect as it is in Temple run and Jet Pack game. In my game my character is a movable plane and the magnetic power appears from opposite direction and once it is collected then its effect remains for few seconds. And in that effect time if any coins are coming from opposite side of the plane then those coins should get attract towards the plane. And those coins are also a box2d body. Right now i am using the SetLinearVelocity to move it to the left end of the screen only changing the x position. In this the once the y position is set its not able to change it. So please any one can help me in this to make magnetic effect work. Any kind of help will be appreciated. Thank you very much.