Piston effort=load due to gas alone?

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Piston effort during the stroke is influenced by both gas pressure and inertia force, as stated in the discussion. Inertia force is relevant even in non-inertial frames because it affects the overall dynamics of the system. Simply equating piston effort with gas force neglects the complexities of motion and energy transfer in the engine. The work done during the power stroke translates into kinetic energy, impacting not only the piston but also the entire drivetrain and vehicle. Understanding these forces is essential for accurate analysis of engine performance.
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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?
 
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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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