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Re: Problem

PHYS-L@lists.nau.edu writes:
It shows a point object with a velocity vector pointing to the top of
the page and an acceleration vector pointing to the right side of the
page at a particular instant in time. It asks if the speed is increasing
or decreasing?

It seems that one would have such a situation on a projectile at the
peak of its vertical motion (turning the page by 90 degrees) and then
its speed would be increasing.

If the acceleration vector is perpendicular to the velocity vecor, the
magnitude of the velocity is not changing. This is the instantaneous case.

I think it is a good and fair question. It will promote discission and
that too is good.

Ken Fox
Science Department Coordinator
IB Physics Teacher
Smoky Hill High School
Aurora, CO