Chapter 6 – Work & Energy

Chapter 6 – Work & Energy

Chapter 6 – Work & Energy

Chapter 6 – Work & Energy

Chapter 6 – Work & Energy

Chapter 6 – Work & Energy

A crate is moved by pulling the rope attached to it. It moves 10m on a straight horizontal road by a force of 100 N. How much work will be done if

(1) The rope is parallel to the road.
Ans. As we know that W = FS cosθ.
If the rope is parallel to the road then θ = 0.
So
W = 100 x 10 x cos0
W = 100 x 10 x 1 (as cos0 = 1)
W = 1000 J

(2) The rope is making angle of 30o with road.
Ans. As we know that W = FS cosθ.
If the rope is parallel to the road then θ = 30o.
So
W = 100 x 10 x cos30o
W = 100 x 10 x 0.866 (as cos0 = 0.866)
W = 866 J

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This Post Has 27 Comments

  1. Maaz

    I need exersices mcqs answers

  2. Essa

    Conceptual

    1. Sohail Abbas

      Concept is in your mind bro take it easy

      1. misal mialoni

        yes bro yes bro les go bro

  3. Daniyal

    Best notes

  4. Frizdaq

    Long Questions are too big

    1. Aima

      Numericalssss!!!!!!

  5. Amna

    Mini exercise please

  6. Ayesha Ghani

    Please alehda sa short questions upload Karen

  7. J Asif

    conceptual questions please

  8. Arooj

    It is very useful I like it

  9. Abdullah

    Please Guess Paper upload karen

  10. naila mazhar

    numerical 6.3 is wrong

    1. Author

      There is no mistake found in it.

  11. Abdur Rahman

    Numerical 6.7 me value ghalat put ke ha

    1. Author

      ok, we’ll correct it.

  12. Muhammad Usman

    Sir plzz post conceptual questions plzz plzzz plzzz

    1. Sarram Qureshi

      Conceptual Q 3 answer plzzz

  13. Kainaat

    you have put wrong value in Numerical please correct it

    1. Author

      ok, we’ll correct it.

  14. Minahil

    plz numericals plzzzzzzzzzzzzplzzzzzzzzzzzxxxxxxxxxxxx

  15. Aima

    I cannot find numericals as all student can see them but why I can’t?

  16. Jibran Kayani

    Long questions are not from book!!!!

    1. Organizer

      ok, we’ll check it.

  17. Jibran Kayani

    Where are the multiple choice questions from? They are not present in the book.

  18. Jibran Kayani

    Please also share solution of new book of Physics Federal Textbook Board Islamabad 2023.

  19. Aterviya Fatima

    Numericals plzzzzzz

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