Survival of the fastest wrote:
Who cares.
37.32 for 6 miles is a weak athlete, gravel or not.
It's a red herring and doesn't address the question. Obviously he cares about his time, and others care how much slower someone is on gravel.
Survival of the fastest wrote:
Who cares.
37.32 for 6 miles is a weak athlete, gravel or not.
It's a red herring and doesn't address the question. Obviously he cares about his time, and others care how much slower someone is on gravel.
The OP has a point and some of the responses are from stupid idiots.
Would run an annual half marathon on that had a mix of pavement, gravel, and packed dirt (but muddy if it had rained). The gravel was rounded and somewhat loose. The difference was about 10 to 15 sec per mile compared to pavement. The packed dirt was more like 5 seconds per mile slower than pavement if relatively dry. More like 10 if it was muddy and you were dodging puddles or running through them.
I ran 1:18s and 1:19s (5:50s gravel, 6:00 on packed dirt, and 6:05-6:10 on the loose gravel) on this course into my 50s and mid-low 35s for 10K on roads.
I hope that time is on a 10% uphill at least.
gravel is faster, less friction.
Science says gravel is 25sec/mile slower at least.
Are you happy now?
So, I had my race today. I ran 10K in 36.20. So I was right when I said that 5 sec/mile was way conserative.
In my case it was 12 sec/mile faster than on gravel.
Less traction means less speed with the same force applied to it. Meaning you will go slower if the friction between you and the ground decreases. It's like running on ice, although an extreme example it may be, it still shows off that fundamental aspect of Newton's third law.
"For every action there is an opposite equal reaction."
It shows that putting force on a object (even the ground) can vary in results depending on the amount of friction. Tires are made to have more friction or less friction. The less friction they create, the slower they will be. Because it takes more force to go the same speed as another car. That has better friction between it and the ground they are driving on.
Force is what we apply to the ground, the ground pushes back at us with equal force. Gravel absorbs some of the kinetic energy we push onto the ground. Taking bits of energy with it. Making a person slower because the energy they produce is being wasted by the loose and shifty gravel.
In conclusion, any vehicle or man will decrease in speed once they meet a surface that produces less traction/friction between them and the ground. Assuming all other conditions are the same and their net force/stride length and speed are the same.
(Stride length and the speed in which each stride is completed is referring to humans only. Vehicles have something else to factor in, but they are relatively the same I'm this context.)
Too much, unless you're talking three-inch deep fine grade gravel. 5 seems good.
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