Last week in Wonders we read about force and motion in our reading groups.  As a fun culminating activity to this, we reviewed what we had learned about force, motion, friction and gravity.  Using what they had learned, the children created a sleigh for Santa, that could travel on the ground.  The children had to take into account the friction that both the ground, and the materials they chose, would create.  It was fun to see how they applied what they had learned in the creation of their sleighs.