Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
I find this to be the most persistent problem in this topics.
I found this demo helps _some_ students.
Tape a block of soft foam to the top of a dynamics cart (Pasco cart and
track). Block should be about the same volume as cart. Have student push the
cart using the foam. Student's finger should sink into foam when pushing.
Socratic method time:
How do you know when you are pushing?
(feel and SEE - maybe I should incorp a buzzer and switch too!)
When did the push end?
Did the push continue after you stopped touching the foam?
If the foam wad still being pushed after you stopped touching, what shape
would it have?
How is the motion of the cart different when you are pushing and when you
are not?
Push the cart to the student and have the student stop the cart by pushing
on the foam. More questions.
... the standard Aristotelian viewpoint and you can bank on the fact
that more than one of your students will be thinking that way!