1. you can set up a timer by setting up the initial position of the shape

 and at regular intervals move the object and repaint the panel.

2.the factor that affect the movement of a graphical object is position, velocity, direction. and turn.

3.Flicker is caused by the speed display medium when painting large complex images that must appear to move rapidly.We could elimiate flicker by simple display of constant motion in two dimensions.

4. A moving object has a velocity, which is the distance traveled in a given unit of time, and a direction.