Question

You are holding a rock tied to a string, which is an example of a pendulum. Identify and explain the proper the term for each part of the pendulum in this example?

Answer 1

I think a more constructive answer is possible ...

Explanation:

The rock is called the “bob”, the string is normally called a “massless rod” and the point where your finger and the string touch is called the “pivot” or “frictionless pivot”

It maybe worth noting that we assume:

(i) the rod is inextensible as well as massless

(ii) the amplitude remains below `~~5^@`

(iii) the bob is a point mass

(iv) there is no air resistance

(v) gravitational force is constant

(vi) the support / pivot is entirely motionless

Hope this is slightly more use than the previous contribution.