Physics
A falling drop of rain water acquires the spherical shape due to

Surface Tension
Atmospheric pressure
Gravitational force
Viscosity

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Physics
Solids have definite shapes.This is because

The forces of cohesion of the molecules within are very much less in them
The forces of cohesion are very large
The forces of adhesion are large
The forces of adhesion are less

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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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