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Re: Pendulum acceleration



Your student did not make the mistake I did, s/he was not
using a static situation to answer a question about a dynamic
situation. The same dynamic approach must be used at other
angles. Please compliment that student on by behalf.
Ludwik Kowalski

Dario Moreno wrote:

On Wed, 24 Oct 2001, talking about an oscillating pendulum,
Ludwik Kowalski wrote:

"In other words, the NET FORCE, and thus the acceleration,
is zero at the bottom and non-zero at an angle, large or small."

On seeing this, an student of mine asked: the pendulum bob is
describing an arc of a circunference, isn't it? So, at the bottom
there must be a net force pointing to the center of the arc, isn't it ?
I said: I agree with you and now your job is to evaluate that
force in terms of the initial release angle.

Dario Moreno