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Piston effort=load due to gas alone?

  1. Dec 16, 2015 #1
    In my book it is mentioned that piston effort along the line of stroke=(Force due to gas pressure)+(Inertia force)

    why we have to consider inertia force when it is a imaginary force which is considered only during non inertial frame?

    why we don't equate piston effort with gas force simple (neglecting friction) why we have to consider inertia force?
     
  2. jcsd
  3. Dec 16, 2015 #2
    the work done during the power stroke is translated into motion energy whether that is just the piston / crank / clutch etc when idling, or including the remainder of the drive train and the vehicle itself when in gear.
     
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