Fill in the blanks
Motion of a needle on a sewing machine is _____ motion

Answer

To fill in the blank for the question "Motion of a needle on a sewing machine is _____ motion," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Motion of the Needle**: Observe how the needle on a sewing machine moves. It goes up and down repeatedly.

2. **Identify the Type of Motion**: The key characteristic of the needle's movement is that it repeats its motion after a fixed time interval. This means it does not move in a straight line or randomly; instead, it follows a specific pattern.

3. **Define the Motion**: The type of motion where an object moves back and forth in a regular pattern is called "oscillatory motion."

4. **Fill in the Blank**: Based on the understanding that the needle moves up and down in a repetitive manner, we can fill in the blank: "Motion of a needle on a sewing machine is **oscillatory** motion."

### Final Answer:
Motion of a needle on a sewing machine is **oscillatory** motion.

---