Question

Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below.
Choose the correct arrangement.
A. Rolling, static, sliding.
B. Rolling, sliding, static.
C. Static, sliding, rolling.
D. Sliding, Static, rolling.

Answer 1

Hint: We need to know the concepts of static, rolling and sliding frictions.
We need to know equations which are related to the given forces if any compare with them.

Complete step by step answer:

We know that rolling friction is the frictional force on the object where the object rolls over a surface whereas the Static friction is the frictional force which kept the object at rest and sliding friction is the frictional force on the object when the object is moving over a surface it is also called kinetic friction.

We know that the static friction acting on a rolling body can be either in the direction of motion or opposite to it depending upon the force action on the body.

Again we know that the Sliding friction is the force of friction below two when one of them is sliding over the surface of the other.

The force of sliding friction static friction between them
Between the same two surfaces once motion is started the friction decodes slightly less than maximum static force dolling friction force of friction that comes into play when one body rolls order the surface of another body to slide an object once the surface of another.

So, the forces of frictions are in the order of

\[{\mathbf{Static}}{\text{ }}{\mathbf{friction}}{\text{ }} > {\text{ }}{\mathbf{sliding}}{\text{ }}{\mathbf{friction}}{\text{ }} > {\text{ }}{\mathbf{Rolling}}{\text{ }}{\mathbf{friction}}.\]

So, the correct answer is “Option C”.

Note:
In order to solve this type of problem we have to know about this definition which does they actually mean static friction portents the motion of an object . More force is needed to start a body moving across a surface than is needed to keep it in motion once started , thus the coefficient of sliding friction for a substance is greater than rolling friction.