Collision Problem and Newton's 2nd Law

[lonelywizard]

How do car bumpers that collapse on impact help to protect a driver?

According to the law of conservation of momentum, p = mv.
Newton's 2nd Law is F = ma, or F = mv/t.
So as t increases, F would decrease, thus less force would be acting on the car at a given time interval.

Any suggestions and comments?

 

[QuantumCrash]

Yes, that's about it. You could also probably analyse it in terms of energy in the sense that the car bumper converts kinetic energy into elastic potential energy.