Let's first have a look at the basics of motion tweening. In Part 1 of the tutorial we will create a simple animation that shows a red circle moving from left to right.

1. Create a new FLA

2. Draw a basic circle and move it to the upper left corner of the scene (fig1)

fig1

3. Now you are going to right click on the first frame of the timeline where your circle resides, in the menu that appears select "create motion tween".(fig2)

fig2

the same result can be achieve by going in Insert / Timeline / Create motion tween (fig3)

fig3

What are we doing here ? by creating a motion tween on the first frame are actually saying to Flash that that position represents the starting point, the initial state of our animation.

4. Right click on frame number 15 and select Insert Keyframe from the drop down menu, we are actually setting up the end point of our animation. (fig4)

fig4