How to Measure the Speed of various objects? Video Lecture | Science Class 7

measuring speed let us conduct a small
activity to measure the speed of an
object we are now going to measure the
speed of a ball draw a straight line
with the help of a chalk
stand about one or two metres away from
the line and roll the ball on the ground
such that it rolls perpendicular to the
line draw record the time at the moment
when the ball touches the line and also
when it comes to rest the distance
between the point where the ball crossed
the line and the point where it came to
rest has to be measured
let different people to be the same
activity and record all the measurements
calculate the speed in each case we can
now compare the speed of various
activities like walking or cycling with
our friends the speed of different
animals can also be measured it is
interesting to know that the satellites
launched into the Earth's orbit by
Rockets obtain a speed of 8 kilometers
per second while a tortoise can move
only at a speed of 8 centimeters per
second once we have a speed of an object
we can find the distance moved in a
given time by using the formula distance
is equal to speed into time
we can also find out the time that a
particular object take to cover a given
distance and a certain speed by using
the formula time taken is equal to
distance by speed one must have observed
Neeta fixed on vehicles to measure the
speed such device is known as pedometer
there is also another device called the
automaker which measures the distance
moved by the vehicle