The document defines key terms related to work, energy, and power in physics. It provides the scientific definitions of work, energy, and power, outlines different types of energy, and discusses the units used to measure work, energy, and power. The key equations for work, kinetic energy, and potential energy are also presented.

2. Submitted To - Mrs Ritu Sexana Submitted By - Amit Sharma and Mohineesh Sharma

4. The intuitive meaning of work is quite Different from the scientific definition of Work . In everyday activity , the term ‘ work’ is used equally for mental and physical work involving muscular force.

5. In physics , the term work is used in special technical sense and has a much more precise definition . DEFINITION When force is acted on a body and the body get displaced through a distance then work is said to be done .

6. There are two conditions that must be satisfied in work done by a body . A force is applied on the object . The object be displaced from its original position.

7. Mathematically Work is defined as the product of force acting on the body and displacement is produced in the body . Formula of work is : W = FScosθ

8. 2 of 10 Peter Loader @ TLT θ (Angle in degree) COSθ O 1 90 0 180 -1

9. CASE 1 When the direction of force and displacement are same . we know W = FScosθ (θ = 0 [in degree] ) W =FScos180 W =FS* 1 W =FS Example- when a body is dropped from a certain height.

10. SI Unit SI unit of work = SI unit of force * SI unit of displacement Joule (J) = N * m J = Nm

11. CGS Unit of work = CGS unit of force * CGS unit displacement erg = dyne * cm erg = dynecm

12. We know 1j =1N * 1m 1j = 100000 dyne * 100 cm 1j = 10000000 erg

13. 1 kilo Joule = 1000 Joule 1 Mega Joule =1000000 Joule

14. ENERGY KINETIC ENERGY POTENTIAL ENERGY MECHANICAL ENERGY LIGHT ENERGY HEAT ENERGY SOLAR ENERGY SOUND ENERGY ELECTRIC ENERGY NUCLEAR ENERGY CHEMICAL ENERGY HEAT ENERGY TIDAL ENERGY WIND ENERGY HYDRO ENERGY

15. Energy of an object is defined as its capacity for doing work and it is measured by the total quantity of work it can do. OR Ability to do work is called energy .

16. SI unit of energy is same as the SI unit of work. i.e. joule (J).

17. There are many types of energy but Kinetic energy and Potential energy have mathematical .

18. Solar Energy Heat Energy Light Energy Chemical Energy Wind Energy Hydro Energy Sound Energy Electric Energy Magnetic Energy Tidal Energy Nuclear Energy Mechanical Energy

19. Solar Energy The energy radiated by the sun is called solar energy used in photosynthesis . Heat Energy When energy released by gas , oil , petroleum products is called heat energy .

20. Light Energy Energy which produce sensation of vision. Chemical Energy Energy which is produced by fuels , chemicals etc.

21. Wind Energy Energy produced by moving air . Hydro Energy The energy produced by flowing water is called hydro energy.

22. Sound Energy Energy which produced by the vibration of object and produced sensation of hearing . Electric Energy Energy Produced by flow of charge .

23. Magnetic Energy Energy produced by magnet . Tidal Energy Energy produced by high and low tides .

24. Kinetic Energy The energy in a body by virtue of its motion is called Kinetic energy . Potential Energy The energy in an object by virtue of its position or configuration is called its potential energy .

25. Nuclear Energy The energy which produced by nuclear reactions is called nuclear energy . Mechanical Energy The sum of kinetic and potential energy is called mechanical energy .

26. Mathematical definition of kinetic energy is equal to half the product of mass and square of velocity .

27. Mathematically potential energy is equal to the product of mass , acceleration due to gravity and height . P.E = M * g * H

28. The conversion of energy from one form of energy to another form of energy is called energy transformation .

29. According to law of conservation of energy can neither be created nor be destroyed only it can be destroyed from one form of energy to another form of energy .

30. POWER

31. Rate of doing work done is called power . OR Work done per unit is called power . W =Work Done T = Time P = W / T

32. si unit of power = si unit of wok / si unit time W = J / SI Unit of power is Watt [ W] and is named in the honor of James Watt .

33. Practical unit of power or a unit which is exclusively used in engineering or in automobiles is called horse power (hp) . 1 hp = 746w

34. It is defined as the ratio of total workdone by the body to the total time taken by the body AP = Total workdone / Total time

35. Commercial unit of electric energy is Kilowatt-Hour (KWH). Commercial Unit of electric energy i.e. KWH is used in household industries for measuring electric energy consumption .

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