# PTB 9th Class Physics Chapter 3 Solved Questions and Numericals Problems

View and Download the solved questions, solved numerical problems or 9th Class Physics notes of Chapter 3 “Dynamics” of Punjab Textbook Board. These 9th class physics notes of 3rd 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 3 Solved Questions and Numericals Problems.

### Unit 3: Dynamics

By studying this chapter students will be able to: Define momentum, force, inertia, friction and centripetal force. Solve problems using the equation Force = change in momentum / change in time. Explain the concept of force by practical examples of daily life. State Newton’s laws of motion. Distinguish between mass and weight and solve problems using F= ma, and w = mg. Calculate tension and acceleration in a string during motion of bodies connected by the string and passing over frictionless pulley using second law of motion. State the law of conversation of momentum. Use the principle of conservation of momentum in the collision of two objects. Determine the velocity after collision of two objects using the law of conversation of momentum. Explain the effect of friction on the motion of a vehicle in the context of tyre surface, road conditions including skidding, braking force. Demonstrate that rolling friction is much lesser than sliding friction. List various methods to reduce friction. Explain that motion in a curved path is due to a perpendicular force on a body that changes direction of motion but not speed. Calculate centripetal force on a body moving in a circle. State what will happen to you while you are sitting inside a bus when the bus

1. Starts moving suddenly
2. Stops moving suddenly
3. Turns a corner to the left suddenly

Write a story about what may happen to you when you dream that all frictions suddenly disappeared. Why did your dream turn into a nightmare?

#### 9th Class Physics Chapter 3 Solved Numericals

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1. Raza khan said:

THERE WAS A QUESTION ON MINI EXERCUSE
CHAPTER3
DYNAMICS
1.CAN A SMALL CHILD PLAY WITH A FAT CHILD ON THE SEE SAW??
THIS WAS QUESTION COME ON SEND UP EXAMINATION.ISLAMABAD BOARD

November 20, 2018

The answer was yes,by making the fat child sit on the center of seasaw on his side and the small child sit on edge of seasaw on his side

February 26, 2019
2. Laeeq said:

A bullet of mass 20 kg is fired from a gun with a mussel velocity 100 m/s.Find the recoil of gun if it’s mass is 5 kg can you help me??

November 7, 2018
3. Ayesha said:

Awesome love it i need some answers and i find it😊

June 5, 2018
4. Sameera khan said:

WHAT HAPPENS WHEN WE PRESS A BALLOON ?

September 24, 2017
• Fatima said:

It bursts:)

March 14, 2018

AOA sir..i want important mcqs short Q/A..and logs plz iif u halp me i will be thankfull!!…i want them its really important…..

July 30, 2017
6. gohar said:

I have a mcqs……newtons first law of motion is valid inly in the absence of friction or net force …????? Plzzz give me ans…

March 22, 2017
• Hamna said:

Net force

September 27, 2018
• MR. said:

Net force

January 17, 2019
7. Bilal said:

SIR.aoa,i also want the solutions for the mcqs in order to know how to solve them?I also wanted to discuss another qs.
If a block of mass 4kg is supported by a string,what is tension in the string?
20N , 40N ,4N , 0N.
Plz SIR I want them very badly.

February 11, 2016

The answers for the MCQs are given on page 16. The tension is basically kind of force on the string. The tension in the string can be calculated from the formula F = mg, now if you assume that g = 10 m/s^2 then tension in string would be 40N.

March 16, 2016

sir please solve the question;if a body have weight of 10N and suspended freely with a string, then what would tention in string?

January 24, 2016

Tension would be equal to the weight of the body, hence 10N.

March 16, 2016
9. Samia said:

Thank u so much 🙂

January 23, 2016
10. angle said:

I have found the definitions
Thank you very much for providing them

November 5, 2015
11. angle said:

Thank you very much
These have halped me much but I will be very grateful to you if you will give the important
definitins also

November 5, 2015
12. mirza said:

sir thank u for making these notes may allah bless u .And pray for me that i should to pass my exams with good marks

October 25, 2015
13. Eesha saqib said:

These answers are soo help full sir thanxxx a lot

October 22, 2015
14. Abu Huraira Khan said:

Sir tell me if there are two masses which mass we should take for m1 or m 2. How we will know ?

October 1, 2015

November 11, 2015
15. Eesha said:

Sir can you upload the reasoning questions according to the chapters plz… btw these are vv helpfull thanks alot

September 27, 2015
16. hifza khan said:

may ALLAH bless him who makes these notes

February 8, 2015
17. Jacqueline said:

sir thank u sooooooo much again 4 such notes these r very perfect note GOD BLESS U

February 4, 2015
18. maha said:

Thank u so much…this is very helpful …sir thank u again..

March 10, 2014
19. affan said:

thanks

February 8, 2014
20. WAQAS IQBAL said:

these notes are not according to kpk text board… can anyone upload that notes…???

February 8, 2014
21. maryam khan said:

sir wo jo ch;8 me experiments or activities han kya wo paper me aasakti hann??????

February 6, 2014
22. nayab said:

thnx alot

January 25, 2014

thanks a lot 4 it. these are so easy definitions.

January 23, 2014
24. musa said:

Sir it is a great job for student. will kindly correct the value “a” in question # 3.5 which is 2 m/s2.

January 4, 2014
25. mehrfatima said:

how it downlodes i cant do it

December 20, 2013
• mehrfatima said:

ohhh i have found it these are amazing thanks

December 20, 2013

March 6, 2014
26. HAMEER said:

THANKS FOR MAKING THIS NOTES AND PLZ GIVE MINI EXERCISE OF CHAPTER 1 2 3 4

December 10, 2013
• jahangirali said:

thank to you that your net look to me everything

December 27, 2013
27. amana said:

itx owesome…tomorrow is my test of this chapter…in my view,it is too easy to learn…but the topic of friction is little difficult…plz pray for my test…test is of 30 marks and i want 30 out of 30…i hope u all will pray for me…these notes are so informative…now i will study on this website ever

December 3, 2013
28. Izzam said:

Send notes of 6,7,8

September 30, 2013
29. DANIYAL said:

August 4, 2013

August 5, 2013
• Jiya Shakir said:

November 10, 2013
30. ayesha noor said:

amazing thanks a lot sir

July 28, 2013
• Hifza said:

Its amazing.Can you please scan down the Think tank of chemistry unit 3

January 22, 2014
31. alishba noor said:

i have in deffecalty thats note solve my defeculty

July 19, 2013

thanks to that person who makes this notes
this notes give me a very absolute concept
(y)

June 23, 2013