$\begin{array}{1 1} \text{F=1.68 N, direction is vertically upwards to the paper } \\ \text{F=1.68 N, vertically downwards to the paper } \\ \text{F=1.68 N, along the surface to the right side of the paper } \\ \text{F=1.68 N, along the surface to the left side of the paper } \end{array} $