Which quantity describes how fast something is moving?

Which quantity describes how fast something is moving?

• A. Movement
• B. Speed
• C. Distance
• D. Direction

Answer: (B)

Speed tells you how quickly something is moving. It’s the distance an object travels in a certain amount of time, so it’s all about the rate of motion. For example, if a toy car covers 4 meters in 2 seconds, its speed is 2 meters per second. This focus on rate means speed doesn’t tell you where the object is going—that’s the job of direction. If you only care about how far it has gone, you’d be thinking about distance, not how fast. If you care about both how fast and where it’s headed, you’re looking at velocity, which combines speed with direction. So, to describe how fast something is moving, you use speed.

Speed tells you how quickly something is moving. It’s the distance an object travels in a certain amount of time, so it’s all about the rate of motion. For example, if a toy car covers 4 meters in 2 seconds, its speed is 2 meters per second. This focus on rate means speed doesn’t tell you where the object is going—that’s the job of direction. If you only care about how far it has gone, you’d be thinking about distance, not how fast. If you care about both how fast and where it’s headed, you’re looking at velocity, which combines speed with direction. So, to describe how fast something is moving, you use speed.