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

Unit 9: Transfer of Heat

By studying this chapter students will be able to: Recall that thermal energy is transferred from a region of higher temperature to a region of lower temperature. Describe in terms of molecules and electrons how heat transfer occurs in solids. State the factors affecting the transfer of heat through solid conductors and hence, define the term Thermal Conductivity. Solve problems based on thermal conductivity of solid conductors. Write examples of good and bad conductors of heat and describe their uses. Explain the convection currents in fluids due to difference in density. State some examples of heat transfer by convection in everyday life. Explain insulation reduces energy transfer by conduction. Describe the process of radiation from all objects. Explain that energy transfer of a body by radiation does not require a material medium and rate of energy transfer is affected by:

• Colour and texture of the surface
• Surface temperature
• Surface area

9th Class Physics Chapter 9 Short Question Answers

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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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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.

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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 Short Question Answers

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