Video Lectures on Physics for the Students of any Age Group

when can i get the solution of the set one questions?

3 years ago by

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sir is neet 2021 syllabus reduced? if so is it from class 12 cbse board syllabus or class 11 and 12 cbse board syllabus?pls help

3 years ago by

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So one basis of above statement can we say that energy can never be created nor be destroyed?? as there is always a negative work is done when there is positive work!!

4 years ago by arnav raj

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where sir zero work?

5 years ago by Arun Prasath

Ans 1 ->

if there is no component of resultant displacement in the direction of force or if the angle between force and displacement is 90 or if the angle between force and velocity is 90 then work done in all these cases is zero .

5 years ago by t arjun

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VGood teaching sir All concept my clear

6 years ago by Aditya Pathak

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Thanks a lot sir Vvvvv thanks

6 years ago by Aditya Pathak

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I did not understand a bit about positive and negative work or gaining and supplying energy.

6 years ago by HARSHA DARBHASAYANAM

Ans 1 ->

work done is positive when something is displaced along the force .it is negative when displacement is opposite to the direction of force .eg : - when a ball is projected upwards work done by gravity is negative [as gravitational force acts downwards and the ball is going upward therefore displacement and force are opposite in direction] and it is positive when the ball moves downward [as gravitational force acts downwards and the ball is going downward therefore displacement and force are same in direction] . hope my answer helps . best regards .

6 years ago by t arjun

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sir please provide me with the explanation of q 11 of the que set 1

7 years ago by

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try it after doing indefinite integration chap proprly

6 years ago by shreyash

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we should assume the mass of boy equal to that of block in this case for them to be displaced equally in opposite directions?

7 years ago by Sarthak Kapil

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sir when a boy is applying a force f on block (as explained in lecture) we studied an equal but opposite force acts on boy as well. but this force is not causing the boy to move..so how come is the block doing work?why isnt it 0 sir?

8 years ago by Ajay Vashishtha

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theres no friction between him and floor..and i think his mass must be equal to the blocks mass

7 years ago by Sarthak Kapil

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Yes my friend you are right but When the boy is applying force on the block the block is also applying same amount of force on the boy in opposite directions and the forces where cancel Each Other, till the force applied by the boy is less than limiting friction and if the force is exceeded limiting friction then a block will tend to move the direction of force

6 years ago by Adarsh mishra

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Sir How to justify that work done is equal to the product of force and displacement?

8 years ago by Eswar Prem

Ans 1 ->

w=f.s f=ma s is displacement and work is something which we did so therefore when we pull a mass some accelaration is produced which will lead us to cover a distance integerating all this we will get work done is equall to the dot product of force and displacement

8 years ago by Mohseen Chawhan

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Sir frictional force have generally -ve work done and -ve work means gaining of energy how frictional force can gain energy

8 years ago by Shivam pandey

Ans 1 ->

-ve work implies that the agent applying force must be gaining some energy. Not the force. In the case of friction. It is applied by the ground and ground gains energy in the form of dissipation energy. Hope it helped you. Thanks!

8 years ago by Abdullah Jafar

Ans 2 ->

ACTUALLY THATS NOT THE REASEN WHEN A FRICTIONAL FORCE IS APPLIED SOME ENERGY IS CONSUMED BY IT AND REMAING WILL BE THERE IN THE BODY

8 years ago by Mohseen Chawhan

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Sir frictional force have generally -ve work done and -ve work means gaining of energy how frictional force can gain energy

8 years ago by Shivam pandey

Ans 1 ->

-ve work implies that the agent applying force must be gaining some energy. Not the force. In the case of friction. It is applied by the ground and ground gains energy in the form of dissipation energy. Hope it helped you. Thanks!

8 years ago by akshat jain

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sir in quset 1... there's a questn whose answer should be 5.76 but the option says 5.28...i'm pretty sure that the answer is 5.76 and i think there's a mistake in another questn..i got the answer as 3mv^2/4^x2....but the option says 3mv^2/4X..please rectify it or please let me know if i'm wrong..

9 years ago by Aditya Prakash

Ans 1 ->

oh..there's a typing mistake...i got the answer as 3mv^2/4x^2

9 years ago by Aditya Prakash

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Sir... Frictional forces have generally -ve work done and -ve work done means gaining of energy . how frictional force can gain energy.... I can't understand

8 years ago by Shivam pandey

Ans 3 ->

Sir... Frictional forces have generally -ve work done and -ve work done means gaining of energy . how frictional force can gain energy.... I can't understand

8 years ago by Shivam pandey

Ans 4 ->

You're right....the answer of that question is 5.76

8 years ago by Abdullah Jafar

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Video Lectures

High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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