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It Provide constant power output to the drive shaft by the torque of the flywheel.
Providing continuous energy when the energy source is discontinuous
Being very simple in answering,FLYWHEEL is a device that stores energy when in excess , and releases it when it is deficient .
Hopefully the link below will define your question's answer. Thanks
https://www.quora.com/What-is-the-purpose-of-a-flywheel-in-an-automobile-engine