Page 27 - Science Class 6 Times Publication

Velocity

When a body moves from one point to another point in a particular
direction, its speed is called velocity.

Therefore, velocity can be dened as speed in a particular direction.
Since the distance in a particular direction is displacement, velocity

can be dened as displacement covered in unit time.
Displacement

Time taken
Velocity =
Since unit of displacement is meter and that of time is second, the
unit of velocity is meter per second (m/s).

Comparison of speed and velocity

Suppose a body moves from point A to B
and then to point C. The distance of AB
and BC is 4m and 3m respectively. Thus,
the total distance is 7m. Suppose, the total
time taken by the body is 2 seconds.

The speed of the body is calculated by using formula

Distance covered (d)
Speed =
Time taken (t)
4 + 3
=
2
= 3.5 m/s

If the body moves directly form A to C, its displacement is 5m.
Therefore, the velocity of the body is calculated by using formula,

Displacement (d)
Velocity=
Time taken (t)

5
=
2
= 2.5 m/s

Times' Crucial Science and Environment 23 Book 6