Motion - Introduction | Don't Memorise - Free Educational videos for Students in K-12 | Lumos Learning

Motion - Introduction | Don't Memorise - Free Educational videos for Students in k-12


Motion - Introduction | Don't Memorise - By Lumos Learning



Transcript
00:03 in our earlier grades , we have studied motion and
00:07 its types . Let's have a quick review . Let's
00:10 start with motion in simple words . If a body
00:14 is moving , it's described as motion . That's all
00:18 in slightly more technical words . Motion is defined as
00:21 a change in the position of a body with time
00:25 yes , changing the position with time . For example
00:29 , When an object is moving from point A to
00:32 point B , it's changing its position with time .
00:35 We thought that the time is also changing along with
00:38 the position . So it is undergoing motion . What
00:42 are the types of motion that we had studied previously
00:46 ? We have seen four types of motion . The
00:48 simplest of all is the rectilinear motion . It is
00:52 the motion of a body in a straight line .
00:55 The example that we saw earlier is of a rectilinear
00:58 motion object is moving in a straight line from a
01:02 to B . There is another type of motion called
01:05 a circular motion . What can this type of motion
01:08 be ? It is the motion of the body along
01:11 the circumference of a circle example . Motion of the
01:15 earth around the sun is an example of circular motion
01:19 . The third type of motion that we saw is
01:22 a rotational motion . It is the motion of a
01:25 body around a fixed axis , which is passing through
01:28 the object . This is important . The Axis has
01:32 to pass through . The object example of rotational motion
01:36 is a ceiling fan rotating along its axle . So
01:40 you see that if I draw a hypothetical line called
01:43 the axis of rotation , that it's passing through the
01:45 fan and the final type of motion is a periodic
01:50 motion , which is the motion that repeats itself in
01:53 equal intervals of time . Can you think of any
01:56 example of this type of motion ? Any object repeating
02:00 its motion in equal intervals of time will be undergoing
02:03 periodic motion as human object is moving in circles and
02:08 discovering each round every three seconds . Is it performing
02:12 a periodic motion ? Absolutely , since it's repeating its
02:16 motion along the same part every three seconds , it
02:19 is undergoing periodic motion . But wait a moment .
02:23 This object is moving along the circumference of a circle
02:27 , so it is also undergoing circular motion . So
02:31 what can you conclude from this example ? We can
02:34 say that an object can undergo more than one type
02:37 of motion at the same time here , rather few
02:40 of the examples of motion in our everyday life go
02:44 through them well and tell me what type of motion
02:47 each one of them represents and note that one example
02:51 could also have more than one type of motion .
02:55 The first one is clearly rectilinear motion . It's a
02:58 car moving along a straight line . The second one
03:02 is interesting . Most of us would have guessed rectilinear
03:05 motion after seeing the words straight . Which type of
03:09 motion are the wheels of an automobile performing ? Are
03:13 they undergoing rotational motion or rectilinear motion , or both
03:18 ? Since the automobile is moving in a straight line
03:21 , it's veals are undergoing both rectilinear and rotational motion
03:25 at the same time . What about the simple pendulum
03:29 ? We know that a simple pendulum performs to and
03:32 from ocean . This two went from motion repeats itself
03:36 in equal intervals of time , so it's undergoing periodic
03:40 motion . Now , let me ask you a question
03:43 . Suppose you want to travel to city be from
03:45 City A . Which mode of transport will get you
03:49 quicker to the destination , a bicycle or an airplane
03:53 , obviously an airplane , because the speed of an
03:56 airplane in air is much quicker than the speed of
03:59 a bicycle on a road . But what a speed
04:03 . Keep watching our videos to know more .
Summarizer

DESCRIPTION:

In our earlier grades, we have studied motion and its types. Let’s have a quick review! Let’s start with motion. In simple words, if a body is moving, it’s described as motion!

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