Physics
The apparent weight of a man in a lift is less the real weight when :

The lift is going down with an acceleration
The lift is going down with uniform speed
The lift is going up with uniform speed
The lift is going up with an acceleration

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

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