def METHOD_NAME(self,obj,worldpt):
    self.sim.updateWorld()
    self.forceObject = obj
    Ro,to = obj.getTransform()
    self.forceAnchorPoint = worldpt
    self.forceLocalPoint = se3.apply(se3.inv((Ro,to)),self.forceAnchorPoint)
    self.sim.addHook(obj,lambda obj:self.simulateForceSpring())