A hammer is hanging by a light rope from the ceiling of a bus. The ceiling of the bus is parallel to the roadway. The bus is traveling in a straight line on a horizontal street. You observe that the hammer hangs at rest with respect to the bus when the angle between the rope and the ceiling of the bus is 67 degrees. What is the acceleration of the bus? Well I know how to solve this, but I'm confused as to why the ball moves in the opposite direction of the force. Say for example the bus moves right, then the ball goes back slightly. When I break the force into components there is one component pointing upwards and one component to the right. But if there is only 1 force acting on the ball and it is to the right, why is the ball going to the left?