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The friction factor used in the Darcy-Weisbach equation to calculate the pressure drop in pipe flows is dependent on the surface roughness inside the pipe and Reynolds number of the pipe flow. The relationship between the friction factor and the relative roughness, Reynolds number can be found in the Moody diagram.
Wiki User
∙ 12y ago
Wiki User
∙ 11y ago.9
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What surface has the least amount of friction?
The surfaces used as the measure of lowest friction are generally wet ice on wet ice. Some materials, such as superfluid Helium III have no measurable friction.
How does a plastic comb and dry hair produce electricity?
friction dry hair + comb = friction
What two factors influence friction force?
Dry friction and fluid friction. Dry friction resists motion of two solid surfaces in contact, while fluid friction describes the friction between layers of liquid that are moving relative to each other.
What stops friction?
Sliding friction (aka dry kinetic friction) between 2 surfaces, is caused due to chemical bonding between the surfaces.
If a water slide was dry how would the friction be different?
Water can absorb friction because it's wet and slippery. When things are dry, there nothing slippery or wet to absorb the friction, so the friction becomes stronger.
What is the friction for smooth dry pavement?
.9
Why is dry pavement creates more friction than ice pavement does?
Because the pavement is more sturdeyer than the ice
Why does it take longer for cars to stop on pavement covered in ice then pavement that is dry?
WHY!It is because the ice makes the friction between the tires and the pavementgreater.
What has a shorter stopping distance water snow or dry pavement?
Dry pavement of course.
What surface has the least amount of friction?
The surfaces used as the measure of lowest friction are generally wet ice on wet ice. Some materials, such as superfluid Helium III have no measurable friction.
What is the braking distance of a car travelling at 20 mph?
That's going to depend on the weight of the car, the composition of the pavement, the tire-tread, whether the brakes apply to 2 wheels or to 4, and whether the pavement is wet, dry, oil-slicked, clean, dirty, rough, or smooth.
How much is stopping distance increased on snow or ice?
Coefficient of friction on dry pavement is around .7 to .75 On snow or ice, it would be around .25 to .3 So, for example at 30 mph, stopping distance on dry pavement would be 40-42 feet. On snow or ice, it would be 100-120 feet. As you can see, it increases quite a bit.
What is dry friction what are the types of dry friction what is fluid friction what are the types of dynamic or kinetic friction?
Fluid friction is the friction that occurs when an object moves through a fluid or gas.
What should the total stopping distance on dry pavement be at 70 MPH?
You should not be travelling on a pavement at 70 mph!
What is the safest distance to follow a motorcycle?
3 seconds behind him, no matter the speed on dry pavement. More on wet pavement.
How does a plastic comb and dry hair produce electricity?
friction dry hair + comb = friction
Front diff wont disengage?
You probably have torque wrap from driving in 4WD on dry pavement. Get off the pavement and try disengaging.
