The object's acceleration has a y-component in situations 1,3 and 4.
Work Step by Step
An acceleration is created when there are unequal forces acting on an object. In all situations, except for 2, there are unequal forces acting in the y-direction. In situation 2, there is a 6N force acting in the positive y direction, and a net total of 6N acting in the negative y-direction.