L10 : Question 1 - Motion & Measurement of Distance, Science, Class 6 Video Lecture

hello friends this video on motion and
measurement of distance part 10 is
brought to you by exam for calm
no more fear from exam but about fast
and slow motion so with this we have
each towards the end of this lesson so
let us quickly look at some of the
questions question number one give two
examples each of modes of transport used
on land water and air so when you talk
about transport and land it could be
anything like a car bus bicycle buying
scooters hootie they are all means of
transport on land when we talk about
water it could be both ship they are not
used on water you talk about air it
could be aeroplane helicopter they are
used to cover distance in air question
number two fill in the blanks one meter
is - centimeter now in this case as you
remember as I have told you before also
that you need to remember that is milli
senti deci meter Baker hecto kilo so
this is what you need to remember so it
is asked 1 meter is how many centimeters
so meter is here meter to centimeter so
we are going from bottom to top so
bottom to talk between multiply x what x
1 two steps so two zeros so multiplied
by 100 so one meter would be equal to
100 centimeter question number two 5
kilometer is - meters 5 kilometer so 1
kilometer is how many meters so again we
are going to bottom from water to top so
we will multiply x what so there are 1 2
3 steps so they reverse will have 3
zeros so basically 1 kilometer is equal
2000 meters so 5 kilometer would be
equal to 5 in 2000 meters so this would
be 5 in 2000 which is equal so this
would be 5000 meters motion of
on the swing is - so any look at the
swing what kind of motion is it so you
just give a small push from behind and
then then it keeps moving like this so
this is an example of periodic motion
because it repeats itself in periodic
intervals of time motion of the needle
of a stooping machine is what kind of
motion is this how does it move it moves
like this up and down up and down up and
down so that is how the needle moves in
assuming machine so this is again
periodic motion because the motion up
and down is getting repeated over
periodic intervals of time motion of V
of a bicycle is now how the wheel of the
bicycle moves like this so it is moving
in a circular path so this is what type
of motion is a circular motion question
of the three why can a piece for a
footstep not be used as a standard unit
of length L the answer is very simple
now anything that we want to be used as
a standard unit has to be uniform in
size it has to be of the same size
everywhere for everyone but when you
think of a footstep a foot step would be
different for different people
so a particular person's footstep might
try to be bigger than another person so
the distance measured by different
individuals foot steps would be
different maybe somebody's footsteps arm
or somebody's footsteps unless so they
do not have a standard length
similarly the size of the foot also
varies from person to person
so they do not have a uniform size so
they cannot be used as the standard unit
of length question number four arrange
the following lengths in their
increasing magnitude increasing
magnitude would mean small to be so
which is the smallest unit out of these
millimetre so many meter would be the
first one next smallest one in
centimeter
next is
and the last one is kilometer question
number five the height of a person is
1.65 meters express it into centimeters
and millimeters so we have to convert
meter to centimeter and then meter to
millimeter so it is write the table
really centi deci meter they cap hecto
kilo so we have to convert from meter to
centimeter and again from meter to
millimeter so these are the two
conversions that we have to do so in
both the cases we have to convert from
bottom to top so we need to multiply and
here this is two steps one two so we
have to multiply by 100 here it is three
steps so we have to multiply by thousand
so we can say that one Luther is equal
to hundred centimeter therefore one
point six five meter will be equal to
one point six five in two hundred
centimeter which would be equal to one
sixty five centimeter similarly one
meter is equal to 1000 millimeter
therefore 1.65 meters would be equal to
one point six five in two thousand and
this is equal to one six five zero
millimeter so this is how we can thank
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