The interaction of forces between Susan's finger and her pencil can be represented by Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. When Susan pushes the eraser with her finger, an equal and opposite reaction force is exerted by the eraser on her finger, resulting in no movement of the pencil.
The interaction of forces between Susan's finger and her pencil can be represented by the figure where we see Susan pushing the tip of her finger against the eraser on the pencil and the pencil not moving.
This can be illustrated by Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In this case, when Susan pushes the eraser with her finger, an equal and opposite reaction force is exerted by the eraser on her finger. These forces cancel each other out, resulting in no movement of the pencil.