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SVTPerformance's Chain of Restaurants
Road Side Pub
Why do peoples shoes fly off their feet when they get hit by a car?
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<blockquote data-quote="CV355" data-source="post: 16257131" data-attributes="member: 181885"><p>When I first started riding a motorcycle, I forced myself to watch hours and hours of motorcycle crash videos on Youtube to force myself to ride responsibly and what to watch for. (I thought I was going to be far less responsible on a bike at first). There were plenty of pedestrian-struck-by-motorcyclist videos mixed in there.</p><p></p><p>In a totally elastic collision, the kinetic energy of all contacted bodies remains the same as prior to the collision. Of course that's nearly impossible, since friction, noise, plastic deformation, etc are all part of a typical collision. In many scenarios, the smaller object is accelerated faster than the maximum speed of either body during the collision due to conservation of energy. It's usually the case when deformation isn't extreme (Crumple zones are designed for this), so that energy has to go somewhere. While accelerating, the body isn't rigid- it ragdolls, causing extremities to whip. This depends on the impact position relative to a centroid and/or anchoring point to create a moment (either causing spinning or a shove motion). That impulse from whipping is what causes shoes to fly off, helmets to come off, and in some cases limbs to be torn partially or completely off. There are too many factors involved in a crash to make the statement that shoes always fly off- it's probably just a certain window of variables that allows that to happen. Most people don't tie and untie their shoes when taking them on and off, so their laces are relatively loose.</p><p></p><p>Most roller-coasters operate in < 3Gs. Extreme ones get upwards of 6Gs. That's enough to launch your shoes off, which is why most of them have "catch nets" installed in the tangent vector of nasty curves / camel-hills / corkscrews above walkways. A 30mph car accident can be 30Gs. A 100mph car accident can be 180Gs. It all depends on how fast deceleration / acceleration occurs. Granted, that insane G-force is very momentary, but that's where the damage happens.</p></blockquote><p></p>
[QUOTE="CV355, post: 16257131, member: 181885"] When I first started riding a motorcycle, I forced myself to watch hours and hours of motorcycle crash videos on Youtube to force myself to ride responsibly and what to watch for. (I thought I was going to be far less responsible on a bike at first). There were plenty of pedestrian-struck-by-motorcyclist videos mixed in there. In a totally elastic collision, the kinetic energy of all contacted bodies remains the same as prior to the collision. Of course that's nearly impossible, since friction, noise, plastic deformation, etc are all part of a typical collision. In many scenarios, the smaller object is accelerated faster than the maximum speed of either body during the collision due to conservation of energy. It's usually the case when deformation isn't extreme (Crumple zones are designed for this), so that energy has to go somewhere. While accelerating, the body isn't rigid- it ragdolls, causing extremities to whip. This depends on the impact position relative to a centroid and/or anchoring point to create a moment (either causing spinning or a shove motion). That impulse from whipping is what causes shoes to fly off, helmets to come off, and in some cases limbs to be torn partially or completely off. There are too many factors involved in a crash to make the statement that shoes always fly off- it's probably just a certain window of variables that allows that to happen. Most people don't tie and untie their shoes when taking them on and off, so their laces are relatively loose. Most roller-coasters operate in < 3Gs. Extreme ones get upwards of 6Gs. That's enough to launch your shoes off, which is why most of them have "catch nets" installed in the tangent vector of nasty curves / camel-hills / corkscrews above walkways. A 30mph car accident can be 30Gs. A 100mph car accident can be 180Gs. It all depends on how fast deceleration / acceleration occurs. Granted, that insane G-force is very momentary, but that's where the damage happens. [/QUOTE]
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Road Side Pub
Why do peoples shoes fly off their feet when they get hit by a car?
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