Question
Which of the following is a vector quantity?
- Speed
- Time
- Distance
- Acceleration
Hint:
Vector quantity have both magnitude and direction
The correct answer is: Acceleration
- Speed is a scalar quantity, having only magnitude and giving no information about direction. For example, 100 m\s is a speed, it tells us how fast an object is traveling, but nothing about in which direction the object is traveling. The vector counterpart to speed is velocity.
- Time is completely separated from direction; it is a scalar quantity. It has only magnitude, no direction.
- Distance is a scalar quantity with only magnitude and not a vector quantity. It means that when an object moves, the direction of the object is not considered; only the magnitude of the distance is considered.
- Acceleration is a vector quantity because it has both magnitude and direction. When an object has a positive acceleration, the acceleration occurs in the same direction as the movement of the object and the opposite is true for negative acceleration.
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When a vector is multiplied by a scaler quantity, the magnitude of the vector quantity changes in accordance with the magnitude of the scaler quantity but the direction of the vector remains unchanged, hence, after multiplication of both the quantities the whole quantity becomes a vector quantity.
|A| if A is a vector, the symbol| | represents
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Scaler quantities are those quantities that can be determined by magnitude and not by direction. These can be determined only by numerical value and not direction
