The fly wheel holds(keeps) momentum. So think of it this way if you physically push a 1000lb car up to 10mph and then stop it by running to the front and pushing the other direction, now try the same thing with a 4000lb car.
What one is easier to start moving?
What one will you get to 10mph faster?
What one will be more likely to keep moving and run you over?
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I move at the speed of awesome.
"It's not rocket surgery!" -MetroMPG
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