Not sure if "peak" may have been a better word than "apex", but this definitely makes the title clearer.

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edit approved May 19, 2020 at 20:06

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For a simple pendulum, why is the centripetal acceleration at a maximum displacement of 90 degrees zero? at the apex

For the image below,Consider the following question.

The answer is C$C$. However,

I am wondering why is there no centripetal force at point R acting towards the center to give it a centripetal acceleration, such that the resultant acceleration vector is pointing down and to the left (or southwest) when both gravity and the centripetal force are accounted for?

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edited May 19, 2020 at 19:03

BioPhysicist

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asked May 19, 2020 at 18:51

Physicsstudent12

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For a simple pendulum, why is the centripetal acceleration at a maximum displacement of 90 degrees zero?

For the image below, the answer is C. However, why is there no centripetal force at point R acting towards the center to give it a centripetal acceleration, such that the resultant acceleration vector is pointing down and to the left (or southwest) when both gravity and the centripetal force are accounted for?

classical-mechanics

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For a simple pendulum, why is the centripetal acceleration at a maximum displacement of 90 degrees zero? at the apex

For a simple pendulum, why is the centripetal acceleration at a maximum displacement of 90 degrees zero?

For a simple pendulum, why is the centripetal acceleration zero at the apex

For a simple pendulum, why is the centripetal acceleration at a maximum displacement of 90 degrees zero?