Watch the weight on a string swinging at the front of the room. Notice where it seems to stop and where it rushes past.

Today you will draw the arc, or curved path, and animate the first swing in wickeditor.com, which needs no account.

Every frame stays on the screen for the same length of time. So the only way to make something look faster is to move it further between frames.

A pendulum is a string with a ball on the end, called the bob. Draw both, then add a guide behind them: a grey arc that shows the path the bob swings along, with small circles that mark where it stops on each frame.

Now make the bob swing out to the left, one frame at a time. In each new frame, paste the bob, drag it to the next small circle on the arc, and draw its string.

The small circles are far apart near the bottom and close together near the end, so the bob rushes through the middle and slows down as it rises, like a real pendulum.

You now have half a swing. It should already look more natural than your bouncing ball from an earlier lesson.

Where on your arc are your frames closest together? Does that match where a real pendulum slows down?