# Rolling Friction: Why Wheels are Used on Solid Surfaces

• avito009
In summary, the invention of wheels was necessary in order to reduce the force of friction and allow objects to move faster. This is because rolling friction is much less than sliding friction, making it easier to move an object by rolling it rather than dragging or sliding it. However, wheels cannot be used in boats because the friction on water is much less than that between solid surfaces, rendering the use of wheels unnecessary. This also explains why airplanes have a streamlined shape to reduce air friction. In contrast, boats use streamlined bodies to decrease friction on water and wheels are not needed as they would not be able to perform rolling motion in that environment. Overall, wheels are most useful when in contact with a surface where friction is greater, making it easier to move
avito009
You have to apply a force to counter the force of friction. In order to move fast the friction has to be reduced. So we have the invention of wheels. Rolling friction is much less than sliding friction. Experience shows that much less force is required to roll an object than to slide or drag it.

But wheels are not used in boats. why?

The friction on water is much less than that between solid surfaces. So because the friction is less the wheels can't be used.

So does that imply wheels are used when in contact with a surface where friction is more?.

avito009 said:
You have to apply a force to counter the force of friction. In order to move fast the friction has to be reduced. So we have the invention of wheels. Rolling friction is much less than sliding friction. Experience shows that much less force is required to roll an object than to slide or drag it.

But wheels are not used in boats. why?

The friction on water is much less than that between solid surfaces. So because the friction is less the wheels can't be used.

So does that imply wheels are used when in contact with a surface where friction is more?.

Actually wheel has got a feature that only 1 point of it should be in contact with the surface so it can perform rollng motion which is in fact stop and go motion.but in case of boat the whole wheels remain inside water so wheel there is of no use there is use of streamlined body to decrease the friction just like how plane have streamlined shape to reduce air friction. thus there would be no use of wheel in water as forces and frictional forces would be acting uniformly at the frontal part of wheel. Thats the reason turbines are not submerged fully inside water. this is what i think hope you got it

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## 1. What is rolling friction?

Rolling friction, also known as rolling resistance, is the resistance to motion that occurs when a wheel or other circular object rolls on a solid surface. It is caused by the deformation of the object and the surface it is rolling on.

## 2. How is rolling friction different from sliding friction?

Rolling friction is different from sliding friction because it occurs when an object is rolling on a surface, while sliding friction occurs when an object is sliding or dragging along a surface. Rolling friction is generally lower than sliding friction, allowing for easier movement of objects.

## 3. Why do wheels reduce rolling friction?

Wheels reduce rolling friction because they distribute the weight of an object over a larger surface area, reducing the pressure and deformation on the surface. This results in less resistance to motion and allows for easier movement.

## 4. How do wheels help with efficiency?

Wheels help with efficiency by reducing the amount of energy needed to move an object. The lower rolling friction allows for smoother and easier movement, requiring less force and energy to be exerted. This makes wheels useful for various applications, such as transportation and machinery.

## 5. What are some examples of how rolling friction is utilized?

Rolling friction is utilized in many everyday objects and activities, such as bicycles, cars, and skateboards. It is also important in industrial settings, where it is used in conveyor belts, pulleys, and other machinery to move objects with minimal resistance. Additionally, rolling friction is a key concept in sports, such as bowling and curling.

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