In which direction will it roll?

      1. to the left?
      2. to the right?
      3. others ...

      4. Think about itĦIĦIĦI And explain why ?

      What if it is pulled in the following way? 
    Want to know the answer ? Try the following java applet! Or find a spool and check it out?


You need to answer the question first in order to start the animation. Pick an answer!

Press Reset for default parameters.

You can click near the top of the green region and drag it up and down.

Press Start to start the animation.

Your suggestions are highly appreciated! Please click

AuthorĦGFu-Kwun Hwang, Dept. of physics, National Taiwan Normal University
Last modified :