What happens when you run over a pebble? 

"DC3 LS, will be perpetually replacing cars until the end of time" (dc3ls-) 01/11/2017 at 23:05 • Filed to: PHYSICS

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I apologize for how stupid big this picture is.

I was just thinking. When you run over a pebble the tire isn’t flexible enough (I think) to give in around the pebble (let’s say the size of a quarter.) However I’m guessing the rock doesn’t push the entire wheel up, since you don’t lose all traction at that corner. So what’s happening Oppos?

bob and john > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:07

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the tire gives. as it rolls over the pebble, the pressure increases until the pebble is ‘in’ the tire.

if its any bigger, then you might feel a slight bump

DC3 LS, will be perpetually replacing cars until the end of time > bob and john 01/11/2017 at 23:09

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Ah, I didn’t think the tire would be that flexible.

gmporschenut also a fan of hondas > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:11

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Tire and spring act like 2 springs in series. tire gives some, spring gives some. How much is dependent on the spring constant of each.

bob and john > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:11

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its rubber. supported by air. why wouldnt it?

HammerheadFistpunch > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:13

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What Peter black said. Watch aired down off road videos for an exaggerated demo

DC3 LS, will be perpetually replacing cars until the end of time > gmporschenut also a fan of hondas 01/11/2017 at 23:15

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I’m guessing I don’t want to know exactly how that works, but it sounds “legit.”

AMGtech - now with more recalls! > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:16

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On top of what others have said about the tire giving, sometimes on certain types of roads under the right conditions, the pebble may be pressed slightly into the road. Think blacktop on a hot summer day.

unclevanos (Ovaltine Jenkins) > gmporschenut also a fan of hondas 01/11/2017 at 23:18

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System Dynamics!

Amoore100 > gmporschenut also a fan of hondas 01/11/2017 at 23:19

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Ah, brings me back to AP Physics 1 two years ago. Funny how it makes so much sense now but back then it didn’t at all.

Sovereign, Purveyor of Coupes > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:19

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Watch a slow motion video of a tennis ball being hit. Same concept, more or less.

unclevanos (Ovaltine Jenkins) > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:20

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The pebble launches into the air creating a slipspace rupture and allowing lizard people to come in and to rule the government.

/s

DC3 LS, will be perpetually replacing cars until the end of time > unclevanos (Ovaltine Jenkins) 01/11/2017 at 23:23

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So speeding does kill by the CIA black ops they run against people who listen to info wars!

Rusty Vandura - www.tinyurl.com/keepoppo > unclevanos (Ovaltine Jenkins) 01/11/2017 at 23:27

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I think the arrive in black helicopters sent by the Russians.

Eric @ opposite-lock.com > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:29

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The tire deforms. How is this not obvious?

macanamera > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:33

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Rock squishes, duh

DC3 LS, will be perpetually replacing cars until the end of time > Eric @ opposite-lock.com 01/11/2017 at 23:34

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I didn’t think they’d deform that much though.  

unclevanos (Ovaltine Jenkins) > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:34

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So buy that endtimes bunker and food ration kit for only three payments of $39,999.99. Also I’ll throw in my anti gay frog chem trail water filter, a $300 value yours for free.

Seat Safety Switch > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:43

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Tire deformation is remarkable.

gogmorgo - rowing gears in a Grand Cherokee > DC3 LS, will be perpetually replacing cars until the end of time 01/11/2017 at 23:48

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They don’t necessarily follow the exact profile of the pebble, more an approximation of it, i.e. with minimum radiuses.

Alternatively, depending on the pebble and how you hit it, it gets wedged in between a couple tread blocks and eventually punctures the tire.

DC3 LS, will be perpetually replacing cars until the end of time > Seat Safety Switch 01/12/2017 at 00:24

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I knew the sidewalls did, but I though the surface, so to speak, was much more rigid.

Shoop > DC3 LS, will be perpetually replacing cars until the end of time 01/12/2017 at 00:46

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The tire deforms. Rubber is soft. Or, it gets caught in the tread pattern.

bhtooefr > DC3 LS, will be perpetually replacing cars until the end of time 01/12/2017 at 07:05

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Forces on the tread actually deform the sidewall.

And, that’s also what really makes low rolling resistance tires - it’s not so much hard compounds and stiff sidewalls, as it is sidewalls that don’t lose a lot of energy in flexing (and therefore are supple).

Dave the car guy , still here > unclevanos (Ovaltine Jenkins) 01/12/2017 at 08:29

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And they frequent our bars when off work.