# Question about rolling friction

• Kaneki123
In summary, the conversation discusses the concept of rolling friction and its role in the motion of a rolling body. It is observed that rolling friction contributes to the rolling motion, but eventually the body comes to a stop. The question is raised about how this can be considered "friction" if it is contributing to motion. The expert explains that friction acts as resistance to motion and causes energy to be dissipated as heat, resulting in a loss of kinetic energy and ultimately causing the rolling body to come to a stop.
Kaneki123
Ok...Suppose I try to roll a ball to the right...Its surface at the point of contact with the floor would be deformed, which would cause some ''rolling friction'' to the left, which in turn would cause some clockwise torque(rolling motion) in the ball...(please point out if something is wrong in my assumption)...My question is that this ''rolling friction'' is actually contributing to the rolling motion of the body, YET it is observed that rolling body eventually comes to a stop...So how does a rolling body comes to a stop?...Another thing is that , if this rolling friction is actually contributing to motion, how is it ''friction''?

Kaneki123 said:
cause some clockwise torque(rolling motion)
Torque is not motion. Resistance is always opposed to motion, and doesn't "cause" it.

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Much easier think of energy dissipation rather than the nuts and bolts of the how friction acts .

If there is friction acting to oppose the motion of an object then there is dissipation of energy as heat .

The moving object has kinetic energy . If energy is being dissipated then that kinetic energy must be reducing with time . Reduction of kinetic energy means reduction of speed . Eventually all kinetic energy is lost and motion ceases .

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## 1. What is rolling friction?

Rolling friction is the resistance force that occurs when an object rolls on a 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 occurs when an object is rolling on a surface, while sliding friction occurs when an object slides or drags along a surface. Rolling friction is generally lower than sliding friction, as there is less surface area in contact between the object and the surface.

## 3. What factors affect rolling friction?

The amount of rolling friction depends on various factors such as the weight of the object, the surface it is rolling on, the speed of the object, and the size and shape of the object.

## 4. How is rolling friction measured?

Rolling friction can be measured using a device called a rolling resistance dynamometer. This device measures the force required to keep an object rolling at a constant speed on a given surface.

## 5. How can rolling friction be reduced?

Rolling friction can be reduced by using smooth surfaces, reducing the weight of the object, and using lubricants. Additionally, using wheels or ball bearings can also help to decrease the amount of rolling friction.

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