Which quantity has magnitude only and no direction?

Which quantity has magnitude only and no direction?

• A. Velocity
• B. Acceleration
• C. Force
• D. Speed

Answer: (D)

Speed is a scalar quantity, which means it has magnitude only and no direction. It tells you how fast something is moving, not where it’s headed. For example, saying a car is moving at 60 kilometers per hour gives you the size of its motion, but not the direction. Other quantities listed include direction in their description: velocity combines speed with a direction (like 60 km/h north); acceleration describes a change in velocity and points in the direction of that change; force has both a size and a direction of the push or pull. So speed is the only one that has magnitude without any directional component.

Speed is a scalar quantity, which means it has magnitude only and no direction. It tells you how fast something is moving, not where it’s headed. For example, saying a car is moving at 60 kilometers per hour gives you the size of its motion, but not the direction. Other quantities listed include direction in their description: velocity combines speed with a direction (like 60 km/h north); acceleration describes a change in velocity and points in the direction of that change; force has both a size and a direction of the push or pull. So speed is the only one that has magnitude without any directional component.