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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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  1.  
    2. can you explain me how to determine that the result would come through(2nd aproach) ucosø=v(b) or u=v(b) cosø are both the cases true or not(please provide the reason of why or why won't we take any of the result)
    1 years ago by Shashwat

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  2.  
    3. Sir, is the acceleration of Block B relative to A
    2 years ago by Dibyojyoti Bhattacharjee

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  3.  
    4. awesome explanation
    2 years ago by Muthu.S

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  4.  
    5. Best
    3 years ago by Mohd Zaid

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  5.  
    6. Sir the way u explain 2 diagram of simple pulley block constrained relation...... it just blew my mind no one had explained me that in my 2 that well..... Sir i am a dropper i am following ur videos for jee mains physics prep... will that be enough to good marks in physics..... Hoping for prompt reply
    3 years ago by

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  6.  
    7. Can’t we do this question which the help of calculating tanQ
    3 years ago by Rhythm Sharma

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  7.  
    8. In the alternative method can we break components of "u" as ucos(theta) = Vb
    3 years ago by

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  8.  
    9. why length of inclined rope is L-y
    3 years ago by shubham singh

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  9.  
    10. 2a will be 3a sir!!!!!!!!!!!!
    4 years ago by
    Ans 1 ->
    there is one more pulley
    4 years ago by

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  10.  
    11. sir my answer is coming 30 m/s...... here speed of block b is wrt to what?
    4 years ago by

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  11.  
    12. sir, better solve by Et.v=0 or Et.a=0
    4 years ago by

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  12.  
    13. method 1 is better
    4 years ago by

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  13.  
    14. Is it important for jee advanced
    4 years ago by
    Ans 1 ->
    Basic tool which is used in most questions from Mechanics. so Important in that sense.
    4 years ago by Ameya Marakarkandy

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  14.  
    15. In the example of block sliding on wedge how did we know that the horizontal component of acceleration of block on wedge was greater than that of wedge moving backwards and subtracted it from the other?
    4 years ago by

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  15.  
    16. sir pls tell in alternate method where you have written vbcostheta there should beVb and where you have written vb there should be vbcostheta because motion is due to the string
    4 years ago by Yash Veer Nagar

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  16.  
    17. Sir, I am still not clear why the extension of the string is considered upto that given point. (Refer video from 0:35 to 0:44)
    4 years ago by RISHIT D

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  17.  
    18. which lecture should i watch first constrained motion or newtons laws of motion?
    5 years ago by Prempal Kumar

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  18.  
    19. you are doing such a great job for welfare great Sir
    5 years ago by chandan kumar

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  19.  
    20. THANKYOU SIR for creating such a wonderful resource
    5 years ago by Nikhil Chaturvedi

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  20.  
    21. sir , as the truck moves left pulley P will go up and the string on Q will gets slacken then the equation will be z=2x y.
    5 years ago by Sunny Kumar

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  21.  
    22. sir , in the example 6 as the truck moves in the left direction pulley p will come upward and the string on Q will gets slacken then the equation will be Z=2X Y. please reply sir its a request.
    5 years ago by Sunny Kumar
    Ans 1 ->
    sir it is z=2x y please answer sir
    5 years ago by Sunny Kumar

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  22.  
    23. Sir is there any short or easy trick for finding vel in constrain motion
    5 years ago by Anisha mohapatra

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  23.  
    24. Sir is there any short or easy trick for finding vel in constrain motion
    5 years ago by Anisha mohapatra

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  24.  
    25. will the constraint relations be same even if we are specified about the masses of both block a and b respectively. PLS GIVE THE REPLY
    5 years ago by Roy Ankush Sanjay

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  25.  
    26. sir i am getting wrong answer by displacement method. answer is coming va=vocostheta1/costheta2
    5 years ago by Divit Goyal

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  26.  
    27. What is tension and how it's concept is applied in pulley problems ?
    5 years ago by Bhavya Pandey

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  27.  
    28. Sir , in booster classes of session 1.3 , i am confused in illustration 8 , as in the similar problem you have done in session 1.3 , you have also taken the component of velocity along the rod but in this problem you have only taken the component of angular velocity. Pls clear my doubt sir .
    6 years ago by Aditya meena

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  28.  
    29. Sir, should I watch constrained motion before NLM?
    6 years ago by

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  29.  
    30. Why add a as ACC of B in ax = a 2acostheta
    6 years ago by Shivam Agrawal

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  30.  
    31. sir, instead of writing v-vcos can we write vcos-v while writnng the velocity of block B in x direction?
    6 years ago by rohit

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  31.  
    32. sir can we print out these examples solved by you if yes then how
    6 years ago by sushil verma

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  32.  
    33. what are booster classes sir and where can i find them??? kindly reply for the same
    6 years ago by MUSKAN BHAWNANI

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  33.  
    34. sir in the alt.method how does the length remain constant when the separation between the boat and boy is decreasing
    7 years ago by gurpreet kour
    Ans 1 ->
    sir i also have the same doubt
    5 years ago by subhash

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  34.  
    35. sir in this question why you have not considered 12x=y??
    7 years ago by Parag Bramh

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  35.  
    36. SIR WHEN WILL UPLOAD NCERT SOLUTIONS OF 11TH CLASS EXAMS ARE COMMING SIR PLEASE HELP ME SIR
    7 years ago by Dhruv Tiwari

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  36.  
    37. How do we solve questions of constrained motion, provided friction comes into play? Please explain, thank you.
    7 years ago by Swapnil Das

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  37.  
    38. in case of block on wedge problem why we haven't considered acceleration due to gravity?
    7 years ago by Mani Kanta Chalamalla
    Ans 1 ->
    it is an assumption the g is not acting thus simplifying the example
    6 years ago by Vivan Maurya

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  38.  
    39. Sir what is acceleration of a block kept on a sphere accelerating with accn. A ; wrt TO GROUND?Thanks in advance!
    7 years ago by Abhishek Jaswal

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  39.  
    40. sir you have resolved Vb and not U if we resolve U then ans comes Ucos (theta)=Vb. How to undersand what to resolve
    7 years ago by Poonam Jain
    Ans 1 ->
    we can only resolve the actual speeds not the speed with which body is not actually moving...
    7 years ago by Physics Galaxy

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  40.  
    41. sir need help in question of Physics Galaxy book Volume 1 in step pulley systems example 22 ?
    7 years ago by Simran
    Ans 1 ->
    Which edition of the book you are following ???
    7 years ago by Physics Galaxy

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  41.  
    42. Sir the acceleration of b w.r.t a should be (2+costheta)a . Sir please explain me if my answer is incorrect.
    7 years ago by Utkarsh Gupta

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  42.  
    43. sir if block is in contact with wedge then why the final answer does not contain resultant of x and y components i.e resultant of 2/root3 and 2
    7 years ago by Anupam kumar

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  43.  
    44. why displacement of string for the movable pulley is not 2x?
    8 years ago by Jabin sultan

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  44.  
    45. if any one dont understand this method there is another shortcut technique for solving such questions watch this https://openload.co/f/m2ss4pYkyzI/Constrained_Motion_Shortcut_Technique_.mp4 also there is another way to solve such problems using tension work method for pulley constraints which has been covered in booster class 1.1 learn all methods to know which would be easier to apply in exam
    8 years ago by akanksh
    Ans 1 ->
    thanks dude but how did u get this video link? that teacher is nice can i get link of all videos by him
    8 years ago by Charan Sai
    Ans 2 ->
    not free. paid lectures see www.etoosindia.com. for above video only watch this https://www.youtube.com/watch?v=Ssmef_wCtBE
    8 years ago by akanksh

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  45.  
    46. suppose if the answer comes in negative value. what should we do?
    8 years ago by sagar choudhury
    Ans 1 ->
    take the motion of block in opposite direction to that you assumed it to move while calculating.
    8 years ago by Ajay Sabarish

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  46.  
    47. sir if we consider friction between these blocks then how to solve this problem??
    8 years ago by Manav kapur

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  47.  
    48. sir why there is no question set inn constrained motion?
    8 years ago by Ryan Chowdhury
    Ans 1 ->
    ....
    7 years ago by SWAMIL JAIN
    Ans 2 ->
    'Cause there is very less physics involved in the problems. (Even though a lot of phy is involved in the result)
    7 years ago by PSai Krishna Kvmb

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  48.  
    49. sir the black titles are covering the solution part during the lecture.....pl do something about it
    8 years ago by Aryan Malguri
    Ans 1 ->
    nothing can be done for this. just listen to the video and write the solution on your own. you will understand better.
    8 years ago by sagar choudhury

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  49.  
    50. 1.In the alternative method the concept that the string have a constant lenth while the boy is pulling it?
    8 years ago by Aryan Malguri

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  50.  
    51. sir can u please explain that type of problem where tension-work method fails and we have to use fundamental method.
    8 years ago by sezal

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  51.  
    52. sir it is very difficult to analyze these displacements.....is there any easy way out to do these problems...actually i read about virtual work theorem...which is quite easier..bt the answers of the above examples are not matching....plz reply as soon as possible
    8 years ago by Khushboo Jain
    Ans 1 ->
    virtual work theorem is not valid for wedge pulley systems http://www.pagalguy.com/articles/constrained-motion-of-a-block-over-a-wedge-34339432
    8 years ago by Ajay Sabarish

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  52.  
    53. sir what if we apply the concept of point of contact of the wedge and the block in the last example ....i mean by equating the components of the acceleration in the perpendicular direction of the sliding surface of the wedge...by doing in this way i get the acceleration of the block to be 2 m/s...which is not matching the answer...plz reply as soon as possible..
    8 years ago by Khushboo Jain

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  53.  
    54. Sir in the block-on-wedge example why the acceleration of the block along x direction isis a2costheta-a1 and not a1-a2costheta?
    8 years ago by Mayank Agrawal
    Ans 1 ->
    what a silly question see generally positive x direction is taken as positive and negative x direction as negative for displacement velocity and acceleration here net horizontal acceleration in this direction of postitive x axis thus a2costheta-a1 even if you consider reverse sign convention there is no change in net acceleration
    8 years ago by akanksh

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  54.  
    55. sir,how you breaked the component of velocity of boat.it's not satisfying pythagorus theorem. and thanks 4 all lectures it worth a lot.
    8 years ago by Amit

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  55.  
    56. i am trying to solve it by relating their displacements......but i am not getting the correct relation.....can u help me out?
    8 years ago by Atulaya Shresth
    Ans 1 ->
    You must try to break components vectorially and add them in their respective axes Moreover, u must take proper reference point
    6 years ago by Arihant jain

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  56.  
    57. by which method i always get exact answer with least mistakes by tension method or by displacement method
    8 years ago by Gayatri Jayesh Bondriya

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  57.  
    58. sir please upload videos on tension method constraint relations
    8 years ago by Gayatri Jayesh Bondriya

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  58.  
    59. if we solve by tenshion method if accleration of A is [a] then what will be the accleration of B 2a ... or .. [2+ cos@]a which one is correct and why
    8 years ago by Gayatri Jayesh Bondriya
    Ans 1 ->
    sr plz reply the above question ..... i too got the same answer by this method..why this method is not ryt..here? plz reply as soon as possible
    8 years ago by Khushboo Jain
    Ans 2 ->
    virtual work theorem is not valid for wedge pulley systems http://www.pagalguy.com/articles/constrained-motion-of-a-block-over-a-wedge-34339432
    8 years ago by Ajay Sabarish

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  59.  
    60. sir but if we apply work done by tension method.. : 6Tx +Ty=0 implies 6x=-y (the coordinate system is along the +ve x & y axis..) whats wrong in dis method.? plz reply thanking you, your obedient student
    9 years ago by vishwanath v pai
    Ans 1 ->
    If you carefully see what you are doing... here on big block displacement x is opposite to 6T so you must write -6Tx + Ty = 0 which will give you y = 6x
    9 years ago by Physics Galaxy

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  60.  
    61. why will the block A move towards right ? they are not connected just by a string . they are connected by a string passing over the pulley.block A will move upward
    9 years ago by amit kawad
    Ans 1 ->
    As length of string is constant.. blocks will move in such a way that the velocity component of each block along the length of string will be constant... in this way you can see the direction in which block A will be moving...
    9 years ago by Physics Galaxy
    Ans 2 ->
    well i feel that block A will first move rightwards for some time T and then it will ascend up!!
    8 years ago by Abhijeet Kushwaha

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  61.  
    62. if a rod is perpendicular to the plane of wedge, the relation between acceleration of wedge and rod is ?
    9 years ago by VIVEK REDDY
    Ans 1 ->
    You need to describe the situation specifically... in question the situation is not clear...
    9 years ago by Physics Galaxy

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  62.  
    63. how is it possible for block p to go up if q is not going down?
    9 years ago by amit kawad
    Ans 1 ->
    In solving the problem you can consider any direction and after solving constrained relation if we get the velocity -ve that means the actual direction is opposite to the one we have taken...
    9 years ago by Physics Galaxy

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  63.  
    64. a plane moving with velocity v landing on ground cast a shadow on ground which moves with velocity u. the plane making angle alpha with ground and the sunrays make angle beta with horizontal.find the velocity of shadow(u) in terms of alpha, beta and v .
    9 years ago by apoorv upadhyay
    Ans 1 ->
    The above problems is there with solution in advance illustrations... pl see all illustration carefully to develop command over the topic...
    9 years ago by Physics Galaxy

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  64.  
    65. How to develop contraint relations for pulley-block systems in which movable pulleys are not massless but have some considerable masses?
    10 years ago by Vaibhav Kumar
    Ans 1 ->
    constrained relations are not affected by mass of pulleies...relation remain the same...as strings are inextensible..
    9 years ago by Physics Galaxy

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  65.  
    66. how to solve these questions using Tension method
    10 years ago by Ashutosh Kumar
    Ans 1 ->
    net Work done by tension forces is zero,i.e. summation(t.s)=0 and then differentiate twice to get t.a=0.
    9 years ago by Abhishekh
    Ans 2 ->
    Yes...
    9 years ago by Physics Galaxy

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