Case Study :
If a weight hung from a string is made to
swing, it always completes one to-and-fro motion
in exactly the same time. In other words, it repeats
the oscillation in equal intervals of time.
A simple pendulum consists of a weight (like small
metallic ball or a piece of stone) tied to a string. The
other end of the string is tied to a rigid support.
Fig. (a) shows the pendulum at rest in its mean
position. When the bob of the pendulum is released
after taking it slightly to one side, it begins to move
to-and-fro [Fig. (b)]. The to-and-fro motion of a
simple pendulum is an example of periodic and
oscillatory motion.
Which of the following does not show periodic motion?
A A car moving at a constant speed
B Pendulum.
C Hands of a clock.
D Revolution of Earth around the Sun.
I marked A but it is showing it unattempted