9th Class Physics Notes For Work And Energy Chapter 6 In PDF

Here you will get theoretical notes of ch#6 work and energy class 9 physics that include all the Long questions, numericals, and exercises short Questions that have been solved.

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  Define work and its SI unit. 

   

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  Calculate work done using the equation Work = force x distance moved in the direction of the force. 

   

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  Define energy, kinetic energy, and potential energy. 

   

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  State unit of energy. 

   

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  Prove that kinetic energy and potential energy. 

   

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  Solve problems using these equations. 

   

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  List the different forms of energy with examples. 

   

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  Describe the processes by which energy is converted from one form to another with reference to

   

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  Fossil fuel energy

   

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  Hydroelectric generation

   

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  Solar energy

   

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  Nuclear energy

   

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  Geothermal energy

   

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  Wind energy

   

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  Biomass energy

   

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  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. 

   

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  List the environmental issues associated with power generation. 

   

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  Explain by drawing energy flow diagrams through steady-state systems such as a filament lamp, a power station, or 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. 

   

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  Define the efficiency of a working system and calculate the efficiency of energy conversion using the formula:

   

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  efficiency = energy output converted into the required form / total energy input

   

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  explain why a system cannot have an efficiency of 100%. Define power and calculate power from the formula: Power = work done / time taken

   

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  Define the unit of power “watt” in SI and its conversion with horsepower. 

   

Solve problems using mathematical relations learned in this unit.