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If a deep river is faster why doesnt the larger wetted perimeter increase friction and slow down the speed of the river?
Wiki User
∙ 15y ago
The speed of a river is affected by the amount of friction slowing down the water and the grade or fall of the river.
The amount of friction is determined by how rough the bed or wetted perimeter is, and how big the perimeter is.
A wide shallow river or a very deep and narrow river with the same volume and grade will be in contact with similar areas of river bed, causing the same amount of friction. But a river with a semi circular shape in cross section and the same volume and grade will have less contact area with the river bed and will therefore have less friction and be faster.
The steeper the grade of the river, the faster it will flow.
Wiki User
∙ 15y ago
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Why does friction increase as the speed increases?
because the forces creating the friction are rub faster(harder).
Why increase friction?
You would increase friction so that you wouldn't slip, by using the brakes on your car of bike you increase friction to stop yourself. Hikers increase friction between their feet and the ground by wearing hiking shoes that grip the ground better. Tires on cars that create more friction make the car go faster, because instead of sliding, the tires grip the ground and push off.
When energy is converted to molecules and they move faster does temperature increase or decrease?
As molecules move faster, they cause friction, which increases the temperature of the molecules.
Is the perimeter of a polygon less than the area of the polygon?
if your perimeter totals the same as 4 times pi then the maximum area that can be encompassed is equal to the perimeter. This is done by forming a circle. if you change the shape of the circle then the area will become smaller than the perimeter(circumference) if you make the circumference of the circle smaller then you will definitely decrease the area faster than you would the perimeter if you make the perimeter bigger then you will definitely increase the area faster than you would the perimeter.
When an object is moving faster through a fluid -how does this affect the force of friction?
In a fluid, the force of friction tends to increase when the speed increases. The exact relationship, however, is far from simple.
How does a car increases and decreases friction?
To increase friction, the car goes faster so that the air resistance becomes greater. To decrease friction the car goes slower to decrease the air resistance acting on the car. Hope that helped:)
Will forcing the water to move faster increase its temperature?
I would expect some increase in temperature to result from forcing water to move faster, since the faster moving water will have more friction with whatever channel or pipe it is moving in, and will have more turbulence which creates waste heat. But the increase in temperature could be very small.
True or False When friction occurs objects increase their speed and move faster?
False because it just cant be true for reasons
What factors speed up diffusion?
Increase the temperatures so the molecules move faster. Stir the solution so friction helps out more. Increase the concentration difference.
List and Explain 2 reasons why you might increase friction between two objects?
Car tires and the road: increasing friction will allow a car to brake faster. Shoes and the ground: increasing friction will make it less likely for you to slip.
Why does temperature increase when two surfaces are rubbing each other?
Friction causes the molecules to vibrate faster, meaning that they produce more heat.
Friction increases as speed increases using the big idea of particles?
Friction occurs when two objects are in close contact. As speed increases, the two touching objects will be rubbing their particles faster against each other, causing an increase in friction.
