- #1
kvkenyon
- 21
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Homework Statement
In a crash test a solid concrete wall is
used to test crashworthiness. A particular
SUV weighs 338.183 kg and is accelerated to
33.3485 m/s before colliding head on with the
barrier.
What impulse must be applied is required
to stop the SUV?
This gives Impulse = 11277.896
The struggle comes with this part:
Through structural analysis of the SUV you
find out that 21801 N will destroy the engine
block. If we ignore the friction between the
car and the ground and assume the force the
wall exerts a constant force on the car, What
is the shortest collision time that will leave
the engine block intact?
Answer in units of s
Homework Equations
Impulse = net force * change in time
p(f) = p(i) + Impulse
The Attempt at a Solution
So I assumed that a force of 21800.9N force would mean that the engine
is not broken. I do not know if this assumption holds. However, it seems to make
sense in my mind. So i figured if the wall exerts a constant force of 11277.896N
causing the car to have a momentum of 0; the change in time is:
21800.9N/11277.896N --> 1.933064465s
But this is apparently wrong.