Ch-2 Work Power and Energy - Part 1 | All Concepts, Tricks | Physics Class 10

Work, energy, power and their relation with force.
Definition of work. W = FS cosθ; special cases of θ = 0, 90. W= mgh.
Definition of energy, energy as work done.
Various units of work and energy and their relation with SI units. [erg, calorie, kW h and eV].
Definition of Power, P=W/t; SI and cgs units; other units, kilowatt (kW), Megawatt (MW) and gigawatt (GW); and horsepower (1hp=746W)
[Simple numerical problems on work, power and energy].
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9:49 for the first example work is not done becuz there's zero displacement but for 2nd example the work is done bcuz there's a displacement in the trolley as seen in the picture

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9:55 - Work is not done in example 1 since No displacement is done but in example 2 work is done because some displacement is done over there.

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in que 3} Workdone against force of gravity won't work done will be equal to FScos90 so the answer should be negative ?

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Light
Human eye
Electricity
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Example number 2 mein work ho Raha hai

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Qn 5) toh bohot easy way mein ho jata.
W = mgh = ( 50 x 10 ) x 25 = 12500 J.
P = W/t = 12500/5 = 2500 W
Direct ho jata

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Sir pushing wall do not do work because displacement is zero but trauli makes displacement so work done in case of pushing a trauli

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24:25

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First go to that course, enroll into the free physics course. Then after that you must go to my courses, the course will play only inside MY COURSES (in app)

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9:39 example:1 no work is done
example:2 work is done

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Part of chapter FORCE is here: th-cam.com/video/AzJTHvmGjFo/w-d-xo.html
Full Chapter and All other chapters are in the course.

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If the moment is happening on the right side it is clockwise moment but if it is happening on the left side it is anticlockwise moment

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2nd case

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Example 2

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example no.2

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Use our website. It works same as the app. Website: amplifylearning.in

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Assertion (A): When retarding force is applied, kinetic energy of the system decrease.
Reason (R): Work and kinetic energy are not equivalent to each other. a) Both (A) and (R) are true and (R) is the correct explanation of (A).
b) (A) is true but (R) is false. c) Both (A) and (R) are true but (R) is not the correct explanation of (A).
d)Both (A) and (R) are false.

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A is true, R is false

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​@@AmplifyLearning but sir Work done is equal to CHANGE in kinetic energy according to work-energy theorem, so how reason can be false?

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No, they are from the Physics textbook.

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Force wala chapter nhi hai

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sir 1st ques mein answer 324.15 J aayega aapne 324.76 J kiya hai, 375*1.732= 648.300/2= 324.15

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2:55 when we carry a bag to our school no work in done because the bag is applying the force in downward direction
Please sir correct

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Waiting for part 2

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Waiting for part 2

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