Sit on a table with the knee flexed over the edge gently

Question

Write the brief description of the following problem

Problem- Sit on a table with the knee flexed over the edge. Gently plantar flex the ankle.

Part 1- What other movements occur in the foot during this plantar flexion (Sagittal & Frontal planes)?

Part 2- In what articulations do these movements occur?

Part 3- Why are they associated with plantar flexion?

I need help to describe the plantar flexion.