Can more than one force act on an object?

Absolutely. To prove this, picture a man standing in a field. His weight is pulling him downwards, but if that were the only force acting upon him, he would have to be in motion. Clearly, there is another force acting upon him to counteract his weight, which in this case would be the force of the ground pushing up on him. For any object at equilibrium, there must be either no force acting upon it, or multiple forces acting upon it, and there is no upper limit to the number of forces acting upon an object.