Which of the following is not a vector quantity?
A) Speed B) Velocity C) Torque D) Displacement
Answers
A) Speed is not a vector quantity.
Explanation :
- Speed is a scalar quantity.
- Speed has only magnitude.
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More details :
Speed :
- Speed can be defined as the distance travelled by per unit time.
- SI unit of speed is m/s.
- Speed = Distance travelled ÷ Time taken
- Speed can't be negative.
- Speedometer measure speed of vehicle.
Average Speed :
The average speed of a body is the total distance travelled divided by total time taken to cover the distance.
Average Speed = Distance travelled ÷ Total Time taken.
Answer:
From this given option a) speed is not a vector quantity
Explanation:
Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction. On the other hand, velocity is a vector quantity; it is
Why is speed classified as a scalar quantity and velocity classified as a vector quantity?
A scalar quantity has magnitude or size, examples: distance, speed. Vector quantities have both magnitude and direction, examples: force, velocity and field strength. Speed here does not have any specific direction and have only magnitude so is a scalar quantity. Velocity is a vector quantity which can be specified both in the magnitude and direction.
Speed is a scalar quantity because it does not need a direction of motion. You can add speeds without considering the direction of motion. 30 km/hr moving eastward is the same as 30 km/hr when moving westward. The speedometer of vehicles just show speed without regard to the direction of motion. We add speed as if we are adding money. The direction of motion is not needed.
KNOW MORE!!
- speed = distance/ time
- time = distance/ speed
- distance = speed × time
☆Speed S.I unit is metre/ second
☆ speedometer is used to indicate speed
☆Odometer records the distance travelled
There are four types of speed
Uniform speed
Variable speed
Average speed
Instantaneous speed
uniform speed: A object is said to be in uniform speed when the object covers equal distance in equal time intervals.
Variable speed: A object is said to be in variable speed when the object covers a different distance at equal intervals of times.
Average speed: Average speed is defined as the uniform speed which is given by the ratio of total distance travelled by an object to the total time taken by the object.
Instantenous speed speed: When an object is moving with variable speed, then the speed of that object at any instant of time is known as instantaneous speed.
Dimensional formula of Distance = M0L1T0
Dimensional formula of time = M0L0T1
Dividing the dimensional formula of distance by the dimensional formula of time, we get:
M0L1T0M0L0T1=M0L0T−1
Example
Speed is a way of measuring how quickly something is moving or being done, or something moving fast. An example of speed is a car being driven 45 miles per hour. An example of speed is someone cleaning a room in 10 minutes. An example of speed is how quickly a jaguar runs.