16. Class 11th Physics | Circular Motion | Turning of an Automobile on a Road | by Ashish Arora

16. Class 11th Physics | Circular Motion | Turning of an Automobile on a Road | by Ashish Arora


http://www.physicsgalaxy.com Skidding of an automobile while taking a turn. Various cases of car while taking a turn on a banked road.

To keep yourself updated about physics galaxy activities on regular basis follow the facebook page of physics galaxy at

The website, aimed at nurturing grasping power students, has classroom lectures on almost all the topics. It is an outcome of 23-year long toil of Physics expert who has made it a mission to simplify the complexities of Physics.

Ashish Arora, the brain behind this interactive unique website, has all his lectures available on web for free of cost. He has created a youtube channel in the name of Physics Galaxy. Today more than 6000 video lectures are being watched per day on this website which is highest among any other e-learning website in India. Till now more than 3.6 Million videos are watched on it. On each video subtitles are also available in 67 languages using google translator including English, Hindi, Chinese, French, Marathi, Bangla, Urdu and other regional and international languages.

Besides uploading transcripts of all his videos, he has created a software based synchronized European voice accent of all videos to benefit students in USA, Europe and other countries.

Reference link of this video is at A

66 Comments on "16. Class 11th Physics | Circular Motion | Turning of an Automobile on a Road | by Ashish Arora"


  1. sir here centripetal force is friction, for an observer in car centrifugal force acts but why these two  forces are drawn in free body diagram with respect to observer

    Reply

  2. Sir, in your books same examples are available in mechanics(2e) , because I not able to see the videos because I have to go to hostel

    Reply

  3. sir if a car is moving along a circular path and suddenly the road became frictionless,then in which direction will the car move from the instant tangential or outward?

    Reply

  4. Sir u say centrifugal force acts on car equals to mv^2 /r… Why not u use centripetal force? Bcoz there is no discussion of interial frames…bcoz it depends on frame whether it will be centripetal or centrifugal firce…. can both terms be used interchangeably? Altleast in this ques? Plz do answer

    Reply

  5. sir if friction will get equal to the maximum value of limiting friction , why it will skid? it will just about to skid; but do not skid i think sir at time 9:46

    Reply

  6. Sir, we can make a simpler expression… if r = angle of repose = arctan(coeff of friction) and e the angle of elevation,

    we can use tan (A-B) formula and say:
    if v∈(sqrt(Rg tan(a-r)) , sqrt(Rg tan(a+r)) ), the car stays stationary in the plane of cross section of road.

    (interesting>>)
    One more thing, I've solved many problems where there are motion impending down or up an incline… I've observed that… ex… for force F so that a block is about to just move up/down a plane , the expressions of F for the other case can be found out by reversing the sign of coefficient of friction of the first case …
    just like in the above case, +r can be replaced with -r and the meaning of the speed implies the opposite…
    So, are there any counter examples to this observations? Also, can this be explained like… for the opposite kind of physical quantity (opposite in the sense that, the opposite of a minimum quantity is a maximum quantity at limiting condition of motion of body under friction) there can be assumed a world where, there is a frictional force that supports relative motion and for that case, coefficient of friction is -ve and the problems solved in such a world would give answers opposite to this world… and if this and that world have opposite meanings to friction, then the minimum of a physical quantity that has something to do with friction in that world is the maximum of that physical quantity in this world ?

    Reply

  7. I need an Explanation on why the centripetal force is acting away from the centre but not towards the centre

    Reply

  8. sir friction acts between the two surface in relative motion with each other but how can the friction act towards centre when the car takes turn bcoz according to definition it should act opposite to the direction of motion of car with respect to banked road which is at rest.

    Reply

  9. Sir, if I will concentrate on each and every topics, examples covered by you in these videos , Will I able to solve various problems related to Circular Motion . ( I had grasp each and every topics explained by you + examples) Hope you reply soon 💐👌👍

    Reply

  10. sir you said centrifugal force acting radially outward is psuedo force then how will it have tendency to skid the car

    Reply

  11. for safe turning without skidding friction force f must be less than mv^2/R it should not be equal …….

    Reply

  12. sir cant we write the skidding will take place when velocity of car becomes root ugr
    thus root 2a1S=root ugr therefore S=ugr/2a1 sir plzz reply i am very confused

    Reply

  13. Thanks for teaching me how to skid . I will use this concept to get involved in road accident…🤣

    Reply

  14. sir why does not centripetal force does not create non inertial reference frame
    And centrifugal force create non reference frame why sir??
    Please explain sir 🙏🙏

    Reply

  15. thanku sir… ap hum sabhi students ki bhaut hellp kar rhe he… there are very few people in this world as good and helpful as you are… You are helping us selflessly.
    we are very lucky to have an amazing teacher like you.
    thanku so much sir… you are a very nice person and best teacher.

    God bless you and your family.

    Reply

  16. Ashis Arora are you fool you are illustrate and jahil
    "HOW COULD YOU APPLY CENTRIFUGAL FORCE IN AN INERTIAL FRAME"
    do you know the Definition of Centrifugal force

    Reply

  17. sir without any non inertial frame how are u taking centrifugal force………………………. please explain if we should assume the non inertial frame for circular motions by own if there it is not given ,……………………..i am getting confused…please explain

    Reply

  18. You are really doing a great job.you have just , cleared all my questions on these topics. Thankyou for that.

    Reply

  19. Sir I have a doubt
    If the car is exactly at the same speed which you mentioned in formula (10:50) It will skid or not???

    Reply

  20. Sir, in first case of skidding of an automobile while taking a turn… U have found the speed wrt to observer in car??…(as u have solved it by centrifugal force)

    Reply

  21. how the centripetal force is greater than or equal to frictional force?? If then frictional force is less enough to balance the centripetal force…..I think frictional force must be grater than or equal to centripetal force…..plz sir give me the explanation….

    Reply

  22. Sir,
    Can you explain from inertial frame that how static friction provides centripetal acceleration??
    (as given in ncert)
    Please reply soon.

    Reply

  23. At 1:00 If car skids then in which direction it skids
    According to observer on ground there will be no outward radial force so it should move in tangential direction
    And according to observer in car it should move in outward direction it should move in outward direction due to centrifugal force
    I am confused help me plzz

    Reply

  24. I can not understand why you show the direction of centripetal force to the outside…….

    Disgusting..

    Reply

  25. Sir centrifugal force is applicable for person sitting inside car (non inertial frame of reference).but how can wheels skid by centrifugal force?

    Reply

Leave a Reply

Your email address will not be published. Required fields are marked *