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] |
On Nov 3, 2011, at 7:29 AM, Dr. Keith S. Taber wrote:
Hm, I'm missing the unless...> "a body in motion TENDS to stay in motion"
> "a body in motion WILL stay in motion"
actually seems better to me than
if the latter is not followed by an unless...
If you are NOT going to give the conditions, then 'tends' is actually
more accurate.
Keith
Howdy,
Why would you ever not give the condition under which it's not true. I always used ``constant rectilinear motion'' and also stated that meant a ``fixed speed in a fixed direction,'' i.e., constant velocity. I usually stated that the First Law concerned the motion of objects when there are NO forces acting on it and the Second Law was about the motion of objects when Forces act on the object. My emphasis with the Third Law was that Action-Reaction pairs NEVER act on the same object (A applies a force ON B the B MUST apply and equal and opposite force ON A).
Good Luck,
Herb Schulz
(herbs at wideopenwest dot com)
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l