You can use a car to show physics ,I have in this thread ,pressure laws,thermodynamic laws and electricity .
A flywheel isn't found in an automatic that has a flex plate ,the torque converter will assist to reduce vibratuon and also help with momentum and puts a load on the engine at idle ,a flywheel allows movement to reduce vibration as its center will move with the clutch friction material in x degrees left or right to reduce vibration .this is why you replace the clutch with a flywheel .vibration can destroy an engine