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Re: acceleration

Forum for Physics Educators <PHYS-L@lists.nau.edu> writes:
-- The scalar acceleration has to do with speed.
Speed is the forward component of velocity.

I'm having trouble with this definition of speed. I am accustomed to
velocity having components, x and y or tangential and radial but forward?
Is that in the instantaneous direction of the vector? Will that not be
differentially different in the next differentially different time?

My limited understanding has speed as the "magnitude" of the velocity. So
I am confused.

Ken Fox