Science 9th 2023 Physics

 Science Syllabus


Physics Chemistry Biology
Work and Energy Atom and Molecules Plant Tissue

We are going to learn in just 10 Minutes

Physics

  • Work and its Unit.
  • Energy and its Unit.
  • Types of Energy


    • Work and its Unit.

    What is Work?
    Work done in moving a body is equal to the product of force exerted on the body and the distance moved by the body in the direction of force.

    Force × Displacement = Work

    Example, thought that you push an object the object will move in straight line with only 1 speed, we will say that there is a work done. (socho tumne 1 car ko dhakka diya, vo car bilkul seedhe direction me move kari vo bhi 1 speed se...)

    "Force aur displacement ka direction same hona chahiye tab work kaha jaeyga!"


    What is Unit of Work?
    W = F × D   
    Unit:
          Force = Newton
          Displacement = Meter
          Work (SI) = Newton + Meter, it is Nm or Joule
          Work (CGS) = dyne cm or erg.

    1 Joule = ?

    1 Joule = 1 Nm = (10⁵ dyne) (100 cm)
             = 10⁵ dyne 10² cm
             = 10⁷ dyne cm
    1 Joule  = 10⁷ dyne cm
              OR
    1 Joule  = 10⁷ erg



    Work done against gravity

    w = (m × g) (d)
    w = work
    m = mass
    g = acceleration due to gravity
    d = height or h = height
    W = mgh
    Whenever work is done against gravity, the amount of work done is equal to the product of weight of the body and the vertical distance through which the body is lifted.


    Question:

    A car weighing 1000 kg and travelling a t 30. m/s stops at a distance of 50m decelerating uniformly. What is the force exerted on it by the brakes? What is the work done by the brakes?



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