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# PTB 9th Class Physics Chapter 6 Solved Questions and Numerical Problems

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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