Grandfather clocks are designed so they can be adjusted by moving the bob at the bottom of the pendulum up or down.Suppose you have a grandfather clock at home that runs fast.Which of the following adjustments of the bob would make it more accurate? (There could be more than one correct choice.)

Question

Quizplus · Accepted Answer

Lowering the bob makes the pendulum shorter and will cause the clock to run slower, thus making it more accurate. Raising the bob would make the pendulum longer and cause the clock to run even faster. Adding more mass to the bob would make it swing slower and also cause the clock to run slower, but removing mass from the bob would have the opposite effect. Decreasing the amplitude of swing would also cause the clock to run slower, but it may not be an easily adjustable option on all grandfather clocks.

Grandfather Clocks Are Designed So They Can Be Adjusted by Moving