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But the tablecloth demonstration is obviously being done on
an earth moving through space at 19 miles/sec. The tableware
items are not at rest by any stretch of the imagination.
Bob at PC
Very true. But besides the fact that research shows howstudents must
explore Newtonian ideas rather than being lectured at, the usualbody at rest
statement
of NTN is pedagogically wrong. It always begins with "A
tendswith a strong
to stay at rest...". So the students never bother with the second
part.
That is obviously just extra stuff. Reformulating NTN1
statement that "Bodies keep moving unless acted on by anexternal force
thatmight also be
stops them" might be helpful. And putting it after NTN2
helpful.that is at rest
Most of the demos used for NTN1 just show how something
tends to stay at rest. The usual tablecloth pull is one ofthem. So
teachers tend to reinforce the wrong thing. The ILDs do not have amisconceptions but just
demonstration of "a body at rest" and instead always have moving
bodies.
A good way to see some of the "misconceptions" is to give any of the
concept
inventories and then do an item analysis and go over it to see which
answers
are given. Of course the FCI does not have all
theresponse answers.
most common ones. Or ask similar questions with free
That is even more enligtening.eventually
John M. Clement
Houston, TX
A classic mis/pre-conception that everyone must deal with
to remain atis Aristotelean thinking.
The 'Natural' state of every object it to be at rest and
_______________________________________________rest until some outside agent makes it move.
Who can deny the reality of this!!!! It JUST makes SENSE ! ! ! ! !
Every successful intro physics student will learn to recite
Newtons First Law -
BUT VERY FEW STUDENTS WILL INTERNALIZE IT ! ! !
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Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l