# PTB 9th Class Physics Chapter 4 Solved Questions and Numericals Problems

View and Download the solved questions, solved numerical problems or 9th Class Physics notes of Chapter 4 “Turning Effect of Forces” of Punjab Textbook Board. These 9th class physics notes of 4th 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 4 Solved Questions and Numericals Problems.

### Unit 4: Turning Effect of Forces

By studying this chapter students will be able to: Define like and unlike parallel forces. State head to tail rule of vector addition of forces/vectors. Describe how a force is resolved into its perpendicular components. Determine the magnitude and direction of a force from its perpendicular components. Define moment of force or torque as moment = force x perpendicular distance from pivot to the line of action of force. Explain the turning effect of force by relating it to everyday life. State the principle of moments. Define the centre of mass and centre of gravity of a body. Define couple as a pair of forces tending to produce rotation. Prove that the couple has the same moments about all points. Define equilibrium and classify its types by quoting examples from everyday life. State the two conditions ‘ for equilibrium of a body. Solve problems on simple balance systems when bodies are supported by one pivot only. Describe the states of equilibrium and classify them with common examples. Explain effect of position of the centre of mass on the stability of simple objects.

#### 9th Class Physics Chapter 4 Solved Numericals

Click 9th Class Physics Notes for other chapter’s notes

These solved numerical problems and question answer are explain properly and we hope that students will not find any difficult or confusion in these notes. But if students have any type of question or query regarding 9th Class Physics Notes, Solved Question Answers and Solved Numerical problems, then they can ask us by commenting below in the comment section.

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THANX

March 6, 2018
2. Maira usman said:

Can you please upload chemistry 9 class solved questions and review excercises and numericals

August 27, 2017

These notes are really helpful for me because I am from a village and I don’t have the facility to join any academy……I this situation the notes are best.

August 24, 2017
4. Baqar said:

Thanks

May 16, 2017
5. damiamalik said:

Explain numerical 4.10

May 7, 2017
6. khaula said:

How is r2 50N in 4.10

March 5, 2016
7. hajat abbas said:

dear sir. I need physics past papers of fbise

March 3, 2016
8. saba said:

i need answer ofmini exercise and quick quiz

November 11, 2015
• laiba khurram said:

What are your questions? I have done all the exercises. Tell me please maybe I can help.

February 8, 2016
9. Huzaifa said:

Sir please give me solved numericals of chapter 4 sindh board

October 30, 2015
10. Arfa said:

I think mcq part 5 answer is wrong its not d its c??

October 4, 2015
• laiba khurram said:

numerical 4.5 answer in finding force is correct but the method is wrong.
the correct one is:
Fx= FCos(thita)
F= Fx divided by Cos(thita)
F= 20 divided by Cos(thita)
F= 20 divided by 0.866
F= 23.1N

February 8, 2016
• Haseeb Hassan said:

Thanks I was having problem in that.

January 10, 2019
11. Shamir said:

plzzzz i need chaoter no 4 turning effect of force quetions answers

September 21, 2015
12. Humna said:

plzzzz i need ch4 mini ex answers

February 12, 2015
13. zoha khan said:

sir i have a question plz….what are vactors

February 5, 2015

Vectors are the quantities which have magnitude and direction as well.

February 13, 2015
14. bilalasif said:

Hello Sir!I Need Chapter No #6 “Work And Energy” All Questions Answer And Numerical problems For My Mid Term Exam

July 23, 2014

hurry up ………….

June 10, 2014
• abdullah said:

June 10, 2014
16. Rimsha Ubaid said:

what about chapter 8’s numericals ? i really need them !

April 6, 2014

nice i like that

January 29, 2014
18. styloofairy said:

also give answers of quick quiz and mini exercises ; if possible …………

January 18, 2014
• rbia said:

very good i like that

June 10, 2014
19. sajid kazmi said:

really good one

December 29, 2013
20. bisma said:

wow they are great

October 19, 2013
21. bisma said:

plz give the notes of 7 chapter

October 19, 2013

I like it plz gives the all chapters numericals of physics

July 7, 2014

nice work

July 7, 2014
22. Waleed said:

Love It

October 4, 2013
23. Danish said:

very nice notes

September 30, 2013
24. summia said:

really nice

September 30, 2013