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. Letâs have a quick review! Letâs start with motion. In simple words, if a body is moving, itâs described as motion!
OVERVIEW:
Motion - Introduction | Don't Memorise is a free educational video by Lumos Learning.
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