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From June NicholasA first-time poster and former HS and TYC instructor who hopes to do more soon
positive velocities. I see the appeal of forces before kinematics._______________________________________________
But I want to be able to refer to constant velocity vs constant
acceleration as I teach about forces. So I would leave this nit
unpicked until I came back to kinematics later.
On Thu, Mar 20, 2014 at 9:31 AM, Rauber, Joel <Joel.Rauber@sdstate.edu>wrote:
One nit to pick.
Phillip K wrote in part:
But what if the ONLY things you wanted to get across were:
PART I -- here is one kind of motion we care about.
1. When an object moves at a constant speed in a straight line, its
position graph is a line.
2. In that case, the slope of that line stays constant. That slope
is the speed.
3. Since the speed is not changing, the "velocity" graph is a
horizontal line.
[:]
[:]
The slope is the velocity not the speed. If the object were moving
at a constant speed in the opposite direction the slope would be
negative, the sign indicating the direction of the velocity vector in
a 1D situation (which I'm assuming is what is happening here).
Unless you only allow objects to move in the positive direction of
how you oriented your coordinate axis.
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Forum for Physics Educators
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_______________________________________________
Forum for Physics Educators
Phys-l@phys-l.org
http://www.phys-l.org/mailman/listinfo/phys-l