PTB 9th Class Physics Chapter 5 Solved Questions and Numericals Problems

View and Download the solved questions, solved numerical problems or 9th Class Physics notes of Chapter 5 “Gravitation” of Punjab Textbook Board. These 9th class physics notes of 5th Chapter are according to the new syllabus (2013) of Punjab Boards including Lahore Board, Gujranwala Board, Sahiwal Board, Rawalpindi Board, Faisalabad Board, Multan Board, Bahawalpur Board, Federal Board, DG Khan Board and Sargodha Board. Students of 9th Class of all these board can facilitate from the physics notes given below. You can also download 9th Class Physics Chapter 5 Solved Questions and Numericals Problems.

Unit 5: Gravitation

By studying this chapter students will be able to: State Newton’s law of gravitation. Explain that the gravitational forces are consistent with Newton’s third law. Explain gravitational field as an example of field of force. Define weight (as the force on an object due to a gravitational field). Calculate the mass of Earth by using law of gravitation. Solve problems using Newton’s law of gravitation. Explain that value of g decreases with altitude from the surface of Earth. Discuss the importance of Newton’s law of gravitation in understanding the motion of satellites.

9th Class Physics Chapter 5 Short Question Answers

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9th Class Physics Chapter 5 Solved Numericals

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45 Comments

  1. taha satti said:

    plz upload solved quick quiz and mini exercises too

    December 2, 2018
    Reply
  2. OnJjongKeyMinTae said:

    The answer to the numerical 5.9 is wrong as compared to the answer in the book

    March 6, 2018
    Reply
  3. Damia Malik said:

    The answer for numerical 5.9 and 5.10 os different as goven in the book…so os it accurate?

    July 12, 2017
    Reply
  4. MOMIN KHAN said:

    sir aoa can u please answer me this
    at what altitude the value of g would become 1/4 than on the surface?
    please answer this ??

    February 7, 2016
    Reply
    • kingsman said:

      If a body is on the surface of Earth, the two forces acting on it are…..W(its weight) & F(Gravitational Force)
      W=F
      =>mg=GmM/(R.R)
      =>g=GM/(R.R)

      Now at certain altitude the expression will be, gh=GM/(R+h.R+h)
      As we are given that gh=g/4
      putting their expressions =>GM/(R+h.R+h)=GM/4(R.R)
      =>(R+h.R+h)=4(R.R)…………………….
      assuming value of h=R in eq(i). It becomes valid.
      So if the altitude is R, then the value of g would become one fourth than on the surface of the Earth.

      January 30, 2018
      Reply
    • Hasan said:

      Hello
      At one radius above the surface of earth the value of g will become 1/4 to that of earth
      It is in the variation of g with altitude topic

      February 12, 2018
      Reply
    • Amin said:

      At an height equal one earth radius

      March 18, 2018
      Reply
  5. maaz said:

    some error in newton laws.you know about it?

    February 6, 2016
    Reply
  6. maaz said:

    who was formulated the law of universal gravitation?

    February 6, 2016
    Reply
  7. Samran sajawal said:

    Very very thank u sir

    September 25, 2015
    Reply
  8. mahi said:

    thanx… you did a gr8 job thank you much

    September 8, 2015
    Reply
  9. munaaza sheikh said:

    please sir ap humein unit 5 ke numericlas bhej den mere paper qarreb hein i need it too

    February 10, 2015
    Reply
  10. sheeza said:

    thnx a lot sir:)

    July 20, 2014
    Reply
  11. rbiasajjad said:

    please upload numericals of chapter 7,8.
    i hope you will……………….Please…………

    June 2, 2014
    Reply
  12. fizza jabeen said:

    dear u did a good job

    April 9, 2014
    Reply
  13. fizza jabeen said:

    dear u did a great job…if u don’t mind then plz try to explain the answer in detail…..

    April 9, 2014
    Reply
  14. Maahi said:

    Thankew alot.. You did a gr8 job.. So much thankewwww.. πŸ™‚

    March 5, 2014
    Reply
  15. ahmed said:

    Sir please 678 k upload kra 18 she paper start ha

    March 1, 2014
    Reply
  16. Zoha Zoya said:

    U did a great job. Plzzzzzzzzzzzzzzz upload the exercises of remaining chapters. I need it on urgent basis.. ThankS

    February 5, 2014
    Reply
  17. umair khattak said:

    thanks sir but upload remaining chapter qkly…..I am wtng

    February 5, 2014
    Reply
  18. Sayeda Hijab Zahra said:

    thanks a lot…..

    January 25, 2014
    Reply
  19. hammadshahid said:

    sir plz upload the numericals of chapter6 ;7 ;8 i hope you will attention on my advice plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

    January 20, 2014
    Reply
  20. princess alina said:

    thankew so much… πŸ™‚

    January 16, 2014
    Reply
  21. SAAD SHEIKH said:

    sir please paste the notes for ch 6, 7 and 8 please its a request …

    December 11, 2013
    Reply
    • SAAD SHEIKH said:

      PLEASE do it hurry

      December 11, 2013
      Reply
  22. MUHAMMED QASIM said:

    SIR PLEASE UPLOAD CH 6.7 nd 8 PLZZZZZZZZZZZZZZZZZZZZZ

    December 11, 2013
    Reply
  23. Pinky.khan said:

    the answer of question 3 of exercise of chapter 5 is not correct.the earth force is greater

    November 2, 2013
    Reply
    • admin said:

      No, the answer is not wrong, it is based on Newtons’s Law of Gravitation.

      March 6, 2014
      Reply
  24. sonu jutt said:

    sir please upload the question and numerical of the chapter no 6 , 7 and 9.

    October 22, 2013
    Reply
  25. Hammad Kamboh said:

    thank for uploading

    October 5, 2013
    Reply
  26. azam mazari said:

    sir please upload the numericals of unit 6 7 and 8 plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

    September 21, 2013
    Reply
    • bisma said:

      itna lamba plz deyan se kahi police na a jay

      October 19, 2013
      Reply
  27. ashmirza said:

    i will be very thanksfull to you but please give some test excersice for are good preparation

    September 10, 2013
    Reply
  28. Angel Gill said:

    plz upload numericals of chapter 6 & 7.

    August 25, 2013
    Reply
  29. ayesha said:

    thank ypu very much sir πŸ™‚

    July 23, 2013
    Reply
  30. SAEED UZ ZAMAN said:

    Dear

    Asslamu alikum

    You did a great work Allah may give you health happiness and long life. If possible please do the remaining chapters.

    July 10, 2013
    Reply
    • admin said:

      Thanks, we will upload soon.

      July 10, 2013
      Reply
    • Hashir said:

      It is better but not the best

      September 24, 2018
      Reply
  31. Ali said:

    great work brother plz upload the remaining chapters

    July 2, 2013
    Reply
  32. Hasnain said:

    Thanks for uploading

    June 9, 2013
    Reply
  33. Kashaf Khalid said:

    ThankU Sir i worried about the numericals but you have solved my problem.

    May 3, 2013
    Reply
  34. Maria said:

    yaar excuse me zuhaib hassan

    April 4, 2013
    Reply
  35. Exam tension said:

    thanks

    March 17, 2013
    Reply
    • ZUHAIB HASSAN said:

      KIA ENSHON HA DR AP KO ZOR SA BOL ALL IS WELL……..>?

      March 21, 2013
      Reply
    • ZUHAIB HASSAN said:

      SO CUTE………………………………..?

      March 21, 2013
      Reply

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