S.h.m Important Answer Urgently Needed

Simple question but thats why its so hard.

If a pendulum swinging at small angles has simple harmonic motion, then at the base of the arc it makes the accelartion is zero.

however we know that in a vertical crcle the accelaration at the base is T-mg. this keeps it moving in a circle, which one is it zero or T-mg.

Reply 1

thelostchild

10

well yes your correct but for small angles the velocity will be low so therefore T-mg will be neglegable so we can ignore it :smile:

Reply 2

figureeight

11

Basically what the above poster said. The object has such little velocity (it doesnt even get a fraction of the way round to completing the circle does it?) that circular motion may as well not apply in the T-mg sense. :smile:

Reply 3

thelostchild

10

mgawa

Simple question but thats why its so hard.

If a pendulum swinging at small angles has simple harmonic motion, then at the base of the arc it makes the accelartion is zero.

however we know that in a vertical crcle the accelaration at the base is T-mg. this keeps it moving in a circle, which one is it zero or T-mg.

also for SHM we consider the acceleration in the direction of motion. at the bottom of the arc the force will be perpendicular to the velocity so there will be no acceleration in the direction of motion :smile:

S.h.m Important Answer Urgently Needed

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