Swinging of clock pendulum is a `"_____"` change.

Answer

To answer the question, "Swinging of a clock pendulum is a '_____'" we can follow these steps:

### Step 1: Understand the Motion of the Pendulum
The clock pendulum swings back and forth in a regular motion. This motion is characterized by a consistent pattern over time.

**Hint:** Think about how the pendulum moves—does it move in a random way or does it follow a specific pattern?

### Step 2: Identify the Type of Change
When we observe the swinging of the pendulum, we notice that it occurs at regular intervals. This means that the pendulum returns to its starting position after a certain amount of time.

**Hint:** Consider whether the change happens at fixed intervals or if it varies each time.

### Step 3: Define the Change
The swinging of the pendulum can be described as a periodic change because it repeats itself over equal intervals of time. Each swing takes the same amount of time, making it periodic.

**Hint:** Look for a word that describes something that repeats after a certain time frame.

### Step 4: Fill in the Blank
Based on the understanding that the swinging of the clock pendulum occurs at regular intervals, we can conclude that the answer to the question is "periodic."

**Final Answer:** Swinging of a clock pendulum is a "periodic" change.