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Author Help figuring something out
mart08uk
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14th Feb 11 at 21:55   View User's Profile U2U Member Reply With Quote
I need to figure out how much force is created when in an accident:

Man 90kg falls off his motorcycle travelling at 30mph and hits a wall..

What does his weight translate into at the point of impact? So if he landed on his arm what weight would be subjected onto his bones?

Maths aint a strong point
mart08uk
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14th Feb 11 at 21:56   View User's Profile U2U Member Reply With Quote
I've got 1602.38 kg. This correct?
Robo C20Let
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14th Feb 11 at 22:01   View User's Profile U2U Member Reply With Quote
i always thought it was the weight of an object x speed
Gary
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14th Feb 11 at 22:04   View Garage View User's Profile U2U Member Reply With Quote
Mass x velocity Is momentum ain't it?

[Edited on 14-02-2011 by Gary]
mart08uk
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14th Feb 11 at 22:11   View User's Profile U2U Member Reply With Quote
Yeah it is, but I need the weight at the impact site..
Robo C20Let
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14th Feb 11 at 22:15   View User's Profile U2U Member Reply With Quote
2700Kg of force i think but im half asleep and cant really be arsed to work it out lol
Gary
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14th Feb 11 at 22:18   View Garage View User's Profile U2U Member Reply With Quote
Do you need acceleration to get force?

F=MA and all that
Robo C20Let
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14th Feb 11 at 22:21   View User's Profile U2U Member Reply With Quote
you dont take that into account when its traveling at 30mph. if it said was accelerating to 30mph that would be different as your not at a constant speed
Gary
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14th Feb 11 at 22:28   View Garage View User's Profile U2U Member Reply With Quote
So what's the equation? Can't remember. Has been years since I've done it like!
oceansoul
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14th Feb 11 at 22:29   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Robo C20Let
you dont take that into account when its traveling at 30mph. if it said was accelerating to 30mph that would be different as your not at a constant speed


Take into account the deceleration from 30 - 0 though. Plus i think all speeds need to be in metric, m/s iirc
Gary
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14th Feb 11 at 22:34   View Garage View User's Profile U2U Member Reply With Quote
I don't think deceleration comes into account as it's the force of the initial impact.
emicen
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14th Feb 11 at 22:47   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by mart08uk
I need to figure out how much force is created when in an accident:

Man 90kg falls off his motorcycle travelling at 30mph and hits a wall..

What does his weight translate into at the point of impact? So if he landed on his arm what weight would be subjected onto his bones?

Maths aint a strong point


The impact deceleration would come from the impulse. Ft=m(v-u) hence the force = (90(30mph-0mph))/time of deceleration

(Mph converted to meters per second)
mart08uk
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14th Feb 11 at 23:03   View User's Profile U2U Member Reply With Quote
Quite confused to say the least! I need to understand the impact weight for a project designing safety equipment for motorbikes..

 
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