I didn't know how to create it, but the logic maybe like this..
1. If there's an object on the SeeSaw board on the left side, the seesaw-board's angle will be increased.
2. If the object on the right side, the seesaw-board's angle will be decreased.
3. If the object not on the seesaw board, the seesaw-board's angle will be turn back to it's normal condition.
<img src="http://s20.postimg.org/cqu5akiil/image.jpg" border="0" />
<img src="http://s20.postimg.org/wk6939vwd/image.jpg" border="0" />
Anyone can help me?
Thanks and sorry for my bad english.