Notes

View and Download the solved questions, solved numerical problems or 9th Class Physics notes of Chapter 6 “Work and Energy” of Punjab Textbook Board. These 9th class physics notes of 6th 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 6 Solved Questions and Numericals Problems.

Unit 6: Work and Energy

By studying this chapter students will be able to: define work and its SI unit. Calculate work done using equation Work = force x distance moved in the direction of force. Define energy, kinetic energy and potential energy. State unit of energy. Prove that kinetic energy and potential energy. Solve problems using these equations. List the different forms of energy with examples. Describe the processes by which energy is converted from one form to another with reference to
• fossil fuel energy
• hydroelectric generation
• solar energy
• nuclear energy
• geothermal energy
• wind energy
• biomass energy
State mass energy equation and solve problems using it. Describe the process of electricity generation by drawing a block diagram of the process from fossil fuel input to electricity output. List the environmental issues associated with power generation. Explain by drawing energy flow diagrams through steady state systems such as filament lamp, a power station, a vehicle travelling at’ a constant speed on a level road. Differentiate energy sources as non renewable and renewable energy sources with examples of each. Define efficiency of a working system and calculate the efficiency of an energy conversion using the formula:
efficiency = energy output converted into the required form / total energy input
explain why a system cannot have an efficiency of 100%. Define power and calculate power from the formula: Power = work done / time taken
Define the unit of power “watt” in SI and its conversion with horse power. Solve problems using mathematical relations learnt in this unit.

9th Class Physics Chapter 6 (Work and Energy) Short Question Answers

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9th Class Physics Chapter 6 (Work and Energy)Solved Numericals

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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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9th Class Physics Chapter 9 Solved Numericals

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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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9th Class Physics Chapter 5 Solved Numericals

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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.

9th Class Physics Chapter 4 Short Question Answers

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9th Class Physics Chapter 4 Solved Numericals

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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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9th Class Physics Chapter 3 Solved Numericals

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View and Download the solved questions, solved numerical problems or 9th Class Physics notes of Chapter 2 “Kinematics” of Punjab Textbook Board. These 9th class physics notes of 2nd 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 2 Solved Questions and Numericals Problems.

Unit 2: Kinematics

After studying this unit, the students will be able to: Describe using examples how objects can be at rest and in motion simultaneously. Identify different types of motion i.e. translatory, (linear, random, and circular); rotatory and vibratory motions and distinguish among them. Differentiate with examples between distance and displacement, speed and velocity.Differentiate with examples between scalar and vector quantities. Represent vector quantities by drawing. Define the terms speed, velocity and acceleration. Plot and interpret distance-time graph and speed-time graph. Determine and interpret the slope of distance-time and speed-time graph. Determine from the shape of the graph, the state of a body including at rest, moving with constant speed and moving with variable speed.

9th Class Physics Chapter 2 Short Question Answers

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9th Class Physics Chapter 2 Solved Numericals

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Correction and Comments about Numericals and Short Question Answers

• Numerical 2.9
  Question Asked by Maria Khan : The answer of numerical 2.9 of 2nd part where the distance is asked to find is, not coming correct.so please check this.your answer is 266.53m but through calculator is 296.14m.plz solve this query.
  Answer : Actually, the value of 266m comes when you do not round off the value of acceleration (means a= -0.3331666875 m/s*s) and all other velocities. So your answer is also correct because you round off the value of acceleration. In exams I would say that write the value of distance 296m because this is the value you computed after rounding off and it is correct also.
• Numerical 2.8
  Problem : Incomplete Numerical and missing page number 14.
  Remaining Part:
  0 = 6vi – 180
  vi = 30m/s
  Now calculating height reached by the ball
  using formula 2as = vf2 – vi2
  putting values in the above formula
  s = (vf2 – vi2)/2a
  s = (0 – 30*30)/2*9.8
  s = 45m approx
  Hence the height reached by the ball is 45 meters and the initial velocity is 30 m/s

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View and Download the solved questions, solved numerical problems or 9th Class Physics notes of Chapter 1 “Physical Quantities and Measurement” of Punjab Textbook Board. These 9th class physics notes of 1st 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 1 Solved Questions and Numericals Problems.

Unit 1: Physical Quantities and Measurements

By studying this chapter students will be able to: Describe the crucial role of Physics in Science, Technology and Society. Explain with examples that Science is based on physical quantities which consist of numerical magnitude and a unit. Differentiate between base and derived physical quantities. list the seven units of System International (SI) alongwith their symbols and physical quantities (standard definitions of SI units are not required). Interconvert the prefixes and their symbols to indicate multiples and sub-multiples for both base and derived units. Write the answer in scientific notation in measurements and calculations. Describe the working of Vernier Callipers and screw gauge for measuring length. Identify and explain the limitations of measuring instruments such as metre rule, Vernier Callipers and screw gauge. Describe the need using significant figures for recording and stating results in the laboratory.

9th Class Physics Chapter 1 Short Question Answers

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9th Class Physics Chapter 1 Solved Numericals

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Correction and Comments about Numericals and Short Question Answers

• Short Question 1.8
  Problem: Wrong answer given in notes.
  Correct Answer:  It is the measurement or value that an instrument shows when it should be showing zero.
• Short Question 1.9
  Problem: Wrong answer given in notes.
  Correct Answer: By knowing the zero error, necessary correction can be made to find correct measurement. Otherwise our reading will be incorrect.
• Numerical 1.7
  Problem : Wrong values of pitch of the screw guage(0.1mm) and number of division(100).
  Correction:  The vale of pitch of the screw should be 0.5mm and number of divisions should be 50 according to the question. There is no change in answer, it remains the same.

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