Negative work formula

    when is work done negative
    when is work done negative in thermodynamics physics
    when is work done negative example
    when is work done negative in thermodynamics
  • When is work done negative

    • Negative work done example!

    Positive, Negative and Zero Work Done

    Positive Work

    When force acts in direction of motion of body, it is called positive work

    Example

    Direction of force and Direction of Motion in the same direction

     

    Negative Work

    When force acts opposite to direction of motion of body it is called negative work

    Example

    Direction of force and Direction of Motion are at angle of 180 degrees


    Zero Work

    When force acts perpendicular to direction of body Or when there is no displacement

    Example

    • Direction of force and Direction of Motion are at right angle (angle of 90 degrees)
    • Force is applied but there is no displacement

     

    When work done is Perpendicular to Direction of Force

    Sometimes force acts perperndicular to the direction of body

    So, angle made between force and distance is 90 degree

    Thus, work done will be 0

     

    Explanation

    We know that

    Work = Force × Distance × cos θ

    Work = Force × Distance × cos 90

     

    Since cos 90 degree = 0

    Work = Force × Distance ×

      when is work done negative in physics
      when is work done negative or positive