Calculate Impact Force Of a Truck Hitting a Deer

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Discussion Overview

The discussion revolves around calculating the impact force of an 8000 lb truck traveling at 55 mph colliding with a 200 lb deer. Participants explore the implications of localized impact and the relevance of momentum conservation in the context of an insurance claim related to vehicle damage.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant questions whether the assumption of a localized hit affects the impact calculations.
  • Another suggests using conservation of momentum to analyze the situation.
  • A participant notes that while the change in momentum can be calculated, estimating the force involved is more complex due to the relationship between force, time, and impulse.
  • Concerns are raised about the speculative nature of any force estimates given the lack of precise timing data during the impact.
  • One participant shares personal experience with vehicle collisions involving large animals, suggesting that documented evidence from similar incidents may be necessary to support the insurance claim.
  • Another participant expresses skepticism about the theoretical solvability of the problem without documented collision evidence.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of calculating the impact force theoretically, with some suggesting it is possible while others believe it is not. There is no consensus on the best approach to substantiate the insurance claim.

Contextual Notes

Participants highlight the need for evidence from documented collisions to support claims about the impact force and resulting damage, indicating that personal anecdotes may not suffice.

Who May Find This Useful

Individuals involved in similar insurance claims, those interested in vehicle collision dynamics, and participants in discussions about the effects of vehicle impacts with large animals may find this thread relevant.

Ryanle
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Trying to calculate the impact of an 8000 lb. truck moving at a rate of 55mph, hitting a 200 lb deer that is standing still in the middle of the road. Does assuming it is a localized hit make any difference? What i mean is, if the deer was hit from the back, and his 200lb wieght was focused in a 2 foot wide area on the front of the truck. Thanks!
 
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What a cruel question :D

Perhaps it would be best to idealize and use conservation of momentum.
 
The reason i am trying to figure it out is for an insurance claim. Not trying to be cruel and evil lol.
 
The change in momentum is easy to calculate: The speed after impact would have been
55X(8000/8200) mph, assuming the deer sticks to the front of the vehicle. This is probably not too relevant as the brakes would have been applied before - or immediately after the impact.

But the Force involved is less easy. The same change in momentum can be achieved by a range of forces and the times they are applied. It's called Impulse.
Impulse = Force X time
Small force X long time can be the same as large force X short time
I assume you didn't have a timer or video camera running so you can't estimate the time taken for the actual impact. I guess your insurer will be aware that any force estimate you were to give would be very speculative. Perhaps they are waiting for you to make a preposterous claim which they can then reject? Are they, perhaps, implying that you were driving too fast?

There is a lot of data, taken from human collisions, which connects front-end damage to vehices (and humans) by body impact with speed of vehicle. You could, perhaps, conduct your own experiments - using insurance inspectors as your subjects. :devil:
 
They are insuring me for the body damage on the truck, but there is also damage to my front axle. They are trying to say there is no way that a hitting a deer could crack a weld on the axle, that's why I'm trying to figure out impact forces to prove them wrong(not looking for exact numbers even). I am pretty sure hitting a 200 lb object in the road, me going 50mph or so, is enough impact to do the damage. BTW, i'll be honest, I'm not that good at complicated math, so any help would be greatly appreciated.
 
I see your problem but I don't think it's soluble theoretically. You need evidence of other documented collisions.
There could be 'off roader' websites / forums with discussions of collision damage. You are clearly not the first person to have hit a large animal in a truck. I remember riding in my Dad's Peugeot 403 across Bodmin Moor when we hit a steer in a patch of fog. It took out the whole of the front end. It was as if we'd hit a tree.
I think your insurer is 'trying it on' so keep posting queries on every 4+4 website you can find . Someone will be able to help, I'm sure, and give you your evidence.
btw, did you get a photo at the crash site?
 

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