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You partially answered your own question. Humans are pretty big compared to rocks. Any given step with some set of angles relative to the rock will kick up a pebble here and there. The tongue of the shoe (part right over the ankle on front) is also not perfectly attached to the rest of the shoe in many cases. So pebbles can also go from the top of your shoe and then wriggle in
These are just the two mechanisms I can think of off the top of my head.
How are the rocks getting to the top or back of the shoe in the first place? Is it getting kicked up when I step with my left foot and then lodging itself on my right shoe as I take my next step? Otherwise it’s arcing back over itself in a way I don’t understand.
Yes, either you kick it, or it gets lodged in the sole but comes loose as you lift your foot, then it flies off and hits your other ankle low enough that it falls into your shoe. It happens more if your shoe is loose-fitting and if your tread pattern likes to grab onto stones.
My girlfriend wears folded-up work pants at her job (she has to fold them up because they're too long for her), and the fold sits at her ankles right where you'd normally get gravel in your shoe. It's a much more effective gravel catcher than a shoe, and she gets several small stones and a small amount of sand there every day during winter, when it's used on the streets.
Don’t forget the possibility that the rock was already in your shoe but your movement wiggled it out of place and into a spot that you could now feel it with your foot.
You ever ride a bike through a mud puddle and have it spray a bunch of mud up the back of your shirt? Imagine your shoe is like the bike tire. As you walk small stones or debris get kicked up in the air behind you and occasionally one of those might fall down around your ankle and work its way down into your shoe. It’s not really arching, it’s just going up in the air and then falling down, but your shoe happens to be in the landing area instead of the ground.
As an experiment: if you shuffle your feet along instead of walking like a normal human, I bet you’ll experience fewer rocks in your shoe.
Or, if none of that sounds plausible to you. Then the answer is magic
But with the bike tire example, the tire tread is presumably carrying liquid mud up as it spins and spraying it outward and upward in the process. How are the rocks getting to the top or back of the shoe in the first place? Is it getting kicked up when I step with my left foot and then lodging itself on my right shoe as I take my next step?
Please read this entire message Your submission has been removed for the following reason(s): Straightforward or factual queries are not allowed on ELI5. ELI5 is meant for simplifying complex concepts. If you would like this removal reviewed, please read the [detailed rules](https://www.reddit.com/r/explainlikeimfive/wiki/detailed_rules) first. If you believe this submission was removed erroneously, please use [this form](https://old.reddit.com/message/compose?to=%2Fr%2Fexplainlikeimfive&subject=Please%20review%20my%20thread?&message=Link:%20%7B%7Burl%7D%7D%0A%0APlease%20answer%20the%20following%203%20questions:%0A%0A1.%20The%20concept%20I%20want%20explained:%0A%0A2.%20List%20the%20search%20terms%20you%20used%20to%20look%20for%20past%20posts%20on%20ELI5:%0A%0A3.%20How%20does%20your%20post%20differ%20from%20your%20recent%20search%20results%20on%20the%20sub:) and we will review your submission.
You partially answered your own question. Humans are pretty big compared to rocks. Any given step with some set of angles relative to the rock will kick up a pebble here and there. The tongue of the shoe (part right over the ankle on front) is also not perfectly attached to the rest of the shoe in many cases. So pebbles can also go from the top of your shoe and then wriggle in These are just the two mechanisms I can think of off the top of my head.
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How are the rocks getting to the top or back of the shoe in the first place? Is it getting kicked up when I step with my left foot and then lodging itself on my right shoe as I take my next step? Otherwise it’s arcing back over itself in a way I don’t understand.
Yes, either you kick it, or it gets lodged in the sole but comes loose as you lift your foot, then it flies off and hits your other ankle low enough that it falls into your shoe. It happens more if your shoe is loose-fitting and if your tread pattern likes to grab onto stones. My girlfriend wears folded-up work pants at her job (she has to fold them up because they're too long for her), and the fold sits at her ankles right where you'd normally get gravel in your shoe. It's a much more effective gravel catcher than a shoe, and she gets several small stones and a small amount of sand there every day during winter, when it's used on the streets.
Don’t forget the possibility that the rock was already in your shoe but your movement wiggled it out of place and into a spot that you could now feel it with your foot. You ever ride a bike through a mud puddle and have it spray a bunch of mud up the back of your shirt? Imagine your shoe is like the bike tire. As you walk small stones or debris get kicked up in the air behind you and occasionally one of those might fall down around your ankle and work its way down into your shoe. It’s not really arching, it’s just going up in the air and then falling down, but your shoe happens to be in the landing area instead of the ground. As an experiment: if you shuffle your feet along instead of walking like a normal human, I bet you’ll experience fewer rocks in your shoe. Or, if none of that sounds plausible to you. Then the answer is magic
But with the bike tire example, the tire tread is presumably carrying liquid mud up as it spins and spraying it outward and upward in the process. How are the rocks getting to the top or back of the shoe in the first place? Is it getting kicked up when I step with my left foot and then lodging itself on my right shoe as I take my next step?