Which was one early problem with pendulum clocks?
a. Making sure the amplitude of the pendulum swing was accurate.
b. The tendency of the pendulum string to stretch.
c. Being able to know when it was the same time somewhere else in the world.
d. Devising a workable mechanism to supply the energy to keep the pendulum swinging.
e. Measuring how fast the sand or water moved through the clock.
Question 2
Which of these affects the period of a string pendulum?
a. The material used to make the string.
b. The force of the initial motion.
c. The mass of the bob.
d. The length of the string.
e. The amplitude of the swing.
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