Physics
Flywheel is an important part of a steam engine because it :

Decreases the moment of inertia
Gives strength to the engine
Helps the engine in keeping the speed uniform
Accelerates the speed of the engine

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Physics
Should cars have bumpers that collapse under impact?

No, since the colliding car would then ram into the occupants and kill them
Yes, since they help to absorb the impact of a collision and keep the occupants safe
No, since it would be very expensive to get the car repaired
Yes, since the offending car should get damaged and pay for the mistake

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