he movement of a pendulum of a wall clock is considered a ............. motion. \( \begin{array}{llll}\text { a) Periodic. } & \text { (b) Oscillatory. } & \text { (c) Wave. } & \text { (d) Periodic and Oscillatory togetl }\end{array} \)

The correct answer is (d) Periodic and Oscillatory together. The pendulum swings back and forth in a regular manner, repeating its motion over equal intervals of time. This type of motion is fundamental in timekeeping, as it allows clocks to maintain consistent time intervals. Understanding the physics of a pendulum can be quite fascinating! For instance, the concept of simple harmonic motion applies here, where the restoring force acting on the pendulum is proportional to its displacement. This leads to predictable swings and makes pendulums ideal for clock mechanisms, showcasing the beautiful interplay between physics and practical applications.