The Chapter Motion for Class 9 Physics, involves topics limited to straight-line motion. One is straight motion with no acceleration and the other is straight motion with constant acceleration.
This article is especially for class 9 students, studying Motion for class 9.
First of all, there are some important terms that the students need to remember,Wiexi.com,and these are:
- Distance
It is defined as the length of the path that is described or travelled by an object that is moving in space. Distance is a scalar quantity given by the SI unit meter denoted by m.
- Displacement
This on the other hand is the shortest distance that exists between the starting point and the ending point that an object travelled in a particular direction. This is a vector quantity, not a scalar as distance and its SI unit is also meter denoted by m.
- Average Speed
The total distance that is being covered by the object divided by the total time taken to cover the total distance travelled by it is defined by a term called the average speed which is a scalar quantity. The SI unit of average is meter/sec (m/s). If an object covers the same distance at the same time, then the object is considered to have a constant speed.
- Average Velocity
Another term is the average velocity which is nothing but a ratio between the total displacement covered or travelled by an object and the total time to cover the total displacement. It is a vector quantity. Its SI unit is meter/s. A body possesses uniform velocity if it covers equal distance at the same time in a specified direction.
- Acceleration
The change of velocity per unit time is defined as acceleration. is a vector quantity. Its SI unit is m/s2. A body is said to have a uniform acceleration if it travels in a straight line with an increase in velocity in an equal interval of time.
Some important concepts to remember and understand
- Distance and displacement are not the same, each has its own definition or explanation. Distance is a scalar quantity whereas displacement is a vector. The distance in a roundtrip is never considered a zero whereas the displacement in a round trip is zero. For example, a person walking around a circle starting from point A and ending in point A, its displacement is taken as zero whereas the distance traveled by it is the circumference.
- The speed is calculated over distance whereas the velocity is calculated over displacement.
- The change in velocity per unit time is known as acceleration. An object that moves with a constant speed but changing the direction will have acceleration as the velocity will change.
There are various ways to solve Motion problems. Here are some effective steps:
- Always make a point to read the problem statement properly, visualize it, and then try to solve the question
- Make sure to jot down whatever is given in the question and whatever is required to find or proof. Generally, the initial and final values of quantities are given.
- Next check which concepts or formulae are applicable in solving and find out what principles of physics is required for solving the problem.
Some important formulae are:
- s= ut
- v=u+at
- s=ut+(1/2)at2
- v2=u2+2as
where s is displacement, u is the initial velocity, v is the final velocity and t is the time.
After knowing the formulae, carry out all the calculations and solve them.
Example: A car that starts from rest has a uniform acceleration of 1 m/s2 along a straight line
- Find the distance moved by car in 5 sec?
- At what time, the velocity becomes 20 m/s?
- How much time it will take to cover a distance of 0.8 km?
Solution:
Given: u=0 m/s, a= 1m/s2, t=5s, v=20 m/s
To find: s, t(20),t
We know that,
- s=ut+(1/2)at2
Substituting the given values in the equation we have,
s=(0)5 +(1/2)1(5)2=12.5 m
- velocity(v)=20 m/s time, t(20)=?
v=u+at
20=0+1t(20)
or t(20)=20 s
- distance(s)=0.8km=800m t=?
s=ut+(1/2)at2
800=(1/2)(1)t2
or t=40 s
The students need to study and practice the numerical on a daily basis and solve as many questions as they can in order to gain confidence in this particular chapter or topic and have a strong foundation about the different concepts. There are many solution books and guide books that can help students in solving problems from this chapter, however, the students must be thorough with all the basic concepts and theories which they can study from the NCERT textbooks which are available both online and offline. Constant practice is needed as by doing this alone, the students can remember whatever they have learned and practice. Students must be sincere and a proper schedule is needed for a smooth study and practicing of problems without confusion.
Do you know the answer of this question: A particle is moving in a circular path of radius r. The displacement after half a circle would be?
For newest news you have to visit world wide web and on world-wide-web I found this web site as a best website for latest updates.
Hmm is anyone else experiencing problems with the images on this blog loading? I’m trying to find out if its a problem on my end or if it’s the blog. Any responses would be greatly appreciated.
I got this site from my pal who informed me about this site and now this time I am visiting this site and reading very informative posts here.
What i do not realize is actually how you’re now not really a lot more smartly-appreciated than you may be right now. You are so intelligent. You know therefore significantly with regards to this topic, produced me for my part consider it from so many numerous angles. Its like men and women don’t seem to be fascinated unless it’s something to accomplish with Lady gaga! Your personal stuffs excellent. All the time maintain it up!
I love it when folks come together and share opinions. Great website, keep it up!
I was recommended this blog by my cousin. I am not sure whether this post is written by him as no one else know such detailed about my difficulty. You are wonderful! Thanks!
We are a group of volunteers and starting a new scheme in our community. Your site provided us with useful information to work on. You have performed an impressive task and our whole community shall be grateful to you.
This post is actually a pleasant one it helps new web people, who are wishing for blogging.
Hi I am so thrilled I found your website, I really found you by error, while I was researching on Google for something else, Nonetheless I am here now and would just like to say thanks a lot for a fantastic post and a all round thrilling blog (I also love the theme/design), I don’t have time to read through it all at the minute but I have book-marked it and also included your RSS feeds, so when I have time I will be back to read a great deal more, Please do keep up the awesome job.
If some one needs to be updated with newest technologies afterward he must be pay a visit this website and be up to date everyday.
Thank you for some other wonderful article. Where else may anyone get that kind of information in such a perfect way of writing? I have a presentation next week, and I am at the look for such information.
An intriguing discussion is worth comment. I believe that you ought to write more on this topic, it might not be a taboo subject but usually people do not speak about such subjects. To the next! Many thanks!!
Thank you a bunch for sharing this with all folks you really recognise what you are talking approximately! Bookmarked. Please also seek advice from my site =). We may have a link exchange contract among us
Today, I went to the beach with my kids. I found a sea shell and gave it to my 4 year old daughter and said “You can hear the ocean if you put this to your ear.” She put the shell to her ear and screamed. There was a hermit crab inside and it pinched her ear. She never wants to go back! LoL I know this is completely off topic but I had to tell someone!
VIP мужской эротический массаж Москва с бассейном
Hi terrific blog! Does running a blog similar to this take a great deal of work? I have no knowledge of programming but I was hoping to start my own blog soon. Anyways, if you have any recommendations or tips for new blog owners please share. I know this is off topic but I just needed to ask. Kudos!
I know this website offers quality dependent posts and additional information, is there any other web site which provides these stuff in quality?
What’s up mates, its impressive post about tutoringand fully explained, keep it up all the time.
This is very interesting, You are a very skilled blogger. I have joined your feed and look forward to seeking more of your magnificent post. Also, I have shared your web site in my social networks!
This is very interesting, You are an overly professional blogger. I have joined your feed and sit up for in search of more of your magnificent post. Also, I have shared your site in my social networks
Good day! I know this is kinda off topic but I was wondering if you knew where I could get a captcha plugin for my comment form? I’m using the same blog platform as yours and I’m having difficulty finding one? Thanks a lot!
Pretty! This was a really wonderful post. Thanks for providing this information.
Undeniably believe that which you stated. Your favorite justification appeared to be on the internet the simplest thing to be aware of. I say to you, I definitely get irked while people consider worries that they plainly do not know about. You managed to hit the nail upon the top and also defined out the whole thing without having side effect , people can take a signal. Will likely be back to get more. Thanks
Hello there, You have performed an excellent job. I will definitely digg it and personally recommend to my friends. I am sure they will be benefited from this site.
Fantastic beat ! I wish to apprentice at the same time as you amend your site, how can i subscribe for a blog web site? The account aided me a appropriate deal. I have been tiny bit familiar of this your broadcast provided bright transparent concept
It’s going to be finish of mine day, but before finish I am reading this impressive piece of writing to increase my experience.
I am curious to find out what blog system you are utilizing? I’m experiencing some minor security problems with my latest website and I would like to find something more safeguarded. Do you have any suggestions?
It’s awesome to go to see this web site and reading the views of all friends concerning this piece of writing, while I am also keen of getting familiarity.
This is a very good tip especially to those new to the blogosphere. Brief but very accurate information Thank you for sharing this one. A must read article!
Have you ever considered about including a little bit more than just your articles? I mean, what you say is fundamental and all. Nevertheless think about if you added some great pictures or video clips to give your posts more, “pop”! Your content is excellent but with images and video clips, this site could certainly be one of the most beneficial in its niche. Good blog!
Hello there, just became aware of your blog through Google, and found that it is really informative. I’m gonna watch out for brussels. I will appreciate if you continue this in future. Lots of people will be benefited from your writing. Cheers!
Hi there it’s me, I am also visiting this web site regularly, this web site is actually good and the users are actually sharing good thoughts.
I think this is one of the most important information for me. And i’m glad reading your article. But want to remark on few general things, The site style is ideal, the articles is really excellent : D. Good job, cheers
Excellent post. I definitely love this website. Stick with it!
I used to be recommended this website via my cousin. I am now not sure whether this publish is written via him as no one else recognise such unique approximately my difficulty. You are wonderful! Thank you!
I simply could not depart your site prior to suggesting that I extremely enjoyed the standard information a person supply on your visitors? Is going to be back incessantly in order to inspect new posts
Remarkable! Its really remarkable post, I have got much clear idea concerning from this article.
Pretty great post. I simply stumbled upon your blog and wanted to mention that I have really enjoyed browsing your blog posts. In any case I’ll be subscribing for your feed and I hope you write again soon!
I simply could not depart your site prior to suggesting that I really enjoyed the standard information a person supply in your visitors? Is going to be back often in order to inspect new posts
you are in reality a just right webmaster. The site loading speed is incredible. It sort of feels that you are doing any unique trick. Moreover, The contents are masterpiece. you have performed a great activity in this matter!
I am currently writing a paper and a bug appeared in the paper. I found what I wanted from your article. Thank you very much. Your article gave me a lot of inspiration. But hope you can explain your point in more detail because I have some questions, thank you. 20bet
Appreciate the recommendation. Will try it out.
It is appropriate time to make a few plans for the longer term and it is time to be happy. I have read this submit and if I may I wish to recommend you few interesting things or advice. Perhaps you could write next articles referring to this article. I wish to read more things approximately it!
Spot on with this write-up, I seriously believe this website needs far more attention. I’ll probably be back again to read more, thanks for the info!
I blog frequently and I really appreciate your content. This great article has really peaked my interest. I am going to book mark your website and keep checking for new information about once a week. I subscribed to your RSS feed as well.
What i do not realize is if truth be told how you’re now not really a lot more well-liked than you may be right now. You are so intelligent. You recognize therefore significantly in relation to this topic, produced me personally consider it from numerous numerous angles. Its like men and women don’t seem to be fascinated unless it’s something to accomplish with Woman gaga! Your own stuffs excellent. Always deal with it up!
This is the right website for anybody who would like to find out about this topic. You understand so much its almost hard to argue with you (not that I actually would want toHaHa). You definitely put a brand new spin on a topic that has been written about for many years. Excellent stuff, just great!
Hi there friends, how is everything, and what you want to say regarding this piece of writing, in my view its really remarkable designed for me.
It’s actually a nice and helpful piece of information. I’m glad that you simply shared this helpful info with us. Please stay us informed like this. Thanks for sharing.
I’m not sure where you are getting your info, but good topic. I needs to spend some time learning more or understanding more. Thanks for fantastic information I was looking for this information for my mission.
I read this post fully about the comparison of most recent and previous technologies, it’s awesome article.
Great site. Lots of useful information here. I’m sending it to a few pals ans also sharing in delicious. And naturally, thank you for your effort!
It’s actually a nice and helpful piece of information. I’m satisfied that you simply shared this helpful info with us. Please stay us informed like this. Thanks for sharing.
Why people still use to read news papers when in this technological world all is accessible on net?