Give two examples of periodic motion.

Explanation

**Step-by-Step Solution:**

1. **Understanding Periodic Motion:**
- Periodic motion is defined as the motion of an object that repeats itself after a fixed interval of time. This means that the object returns to its original position after a specific duration.

2. **Example 1: Pendulum**
- A pendulum is a classic example of periodic motion. It swings back and forth from one point (let's call it point A) to another point (point B) and then returns to point A. This motion occurs repeatedly after a fixed time interval, which is the time it takes to complete one full swing (from A to B and back to A).

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