A grandfather clock keeps time using a pendulum whose length is finely adjustable. If you have a grandfather clock that is running fast, should you shorten or lengthen the pendulum?
A) Shorten it
B) Lengthen it
C) You should reduce its mass
D) You should add mass to it

Question

Quizplus · Accepted Answer

To slow down the grandfather clock, the pendulum needs to be lengthened. This will increase the time it takes for the pendulum to complete each swing, resulting in a slower overall timekeeping.

A Grandfather Clock Keeps Time Using a Pendulum Whose Length