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 the offending car should get damaged and pay for the mistake
Yes, since they help to absorb the impact of a collision and keep the occupants safe

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value depending on amount of water in the pail

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