Question

What are speed and velocity? Write two differences between them.​

Answer 1

Answer:

The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion.

In everyday use and in kinematics, the speed of an object is the magnitude of the change of its position; it is thus a scalar quantity. Wikipedia

SI unit: m/s, m s−1

DIFFERENCE-

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. ... On the other hand, velocity is a vector quantity; it is direction-aware. Velocity is the rate at which the position changes.

Explanation:

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Answer 2

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Speed -:

• The rate at which an object covers a certain distance is known as speed.

• Speed is a Scalar quantity .

• Speed is measured in m/s.

• v = d / t ; where ‘v’ is the average speed, ‘t’ is time taken to travel the distance and ‘d’ is the distance travelled.

Example -: A sports bike travelling at 50 m/s would go from 0 m/s to 30 m/s, before reaching 50 m/s and could even reach 70 m/s.

However, the average speed will be the speed of the bike.

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Velocity -:

• Velocity can be defined as the rate at which an object changes position in a certain direction.

• Velocity is a Vector quantity .

• Velocity is measured in m/s.

• v = ∆x/∆t ; where 'v' is the average velocity, ‘∆t’ is the time of arrival and ‘∆x’ is the displacement.

Example -: A train going towards the south direction with an average speed of 50 km/h will have a velocity of 50 km/h, north.

An object going straight in a particular direction is considered to have velocity.

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