Rolling Friction: Overview, Questions, Preparation

Laws of Motion 2021

Vipra Shrivastava

Vipra ShrivastavaSenior Manager - Content

Updated on Aug 17, 2021 01:58 IST

What is Friction?

The fluid friction acts as the resistance between the relative motion of the surface, materials sliding against each other, and the layers of the fluids. It resists the motion acting between the surfaces.

Types of Friction

The types of friction are listed below:

  1. Dry friction – It resists the lateral motion between the connect of two surfaces
  2. Fluid friction – It resists the relative motion between the layers of the fluid
  3. Lubricated friction – It is a part of fluid friction; only the separation of two surfaces takes place with a lubricant fluid
  4. Skin friction – The force that acts between the solid surfaces resist the motion of the fluid across the skin's surface
  5. Internal Friction – This force resists the motion of deformation

Rolling friction

The Rolling Friction is described as the force resisting the motion of two rolling surfaces of the objects. Examples of Rolling Friction are rolling of a ball, cart trolley in supermarkets, wheel on the ground, etc. Rolling Friction is somewhat weaker than Sliding Friction.

The factors that affect the Rolling Friction are as follows:

  • Load
  • Diameter of object
  • Surface area
  • The surface's quality
  • And the quality of the sliding object

Laws of Rolling Friction

The Rolling Friction has three laws that are as follows:

  1. The first law of Rolling Friction states that a smooth surface decreases the force of it
  2. The Rolling Friction shows the relation between load and constant that is expressed below:

F = kLn

  1. It is inversely proportional to the radius of the curvature and directly proportional to load; it can be written as:

F = u x W / r

Coefficient of Rolling Friction

The coefficient of Rolling Friction can be described as the relationship between the force of rolling friction and the total weight of the object. It can be written as:

  • Fr = urW
  • Here, the resistive force is denoted as Fr
  • The weight of the body is denoted as W
  • And the coefficient of rolling resistance is denoted as UR

Rolling Friction for Class 11

The chapter 'Friction' holds a weightage of a significant 14 marks. The chapter is very important as per the new pattern of 2021. It includes six questions in total, consisting of two objective type questions, two very short questions, one short, and one long question.

Illustrated Examples of Rolling Friction

Example 1) Write the coefficient of Rolling Friction.

Answer – The coefficient of Rolling Friction is Fr = urW.

Example 2) Write the examples of Rolling Friction.

Answer – The examples of Rolling Friction are rolling of a ball, cart trolley in supermarkets, wheel on the ground, etc.

Example 3) State the Third Law of Rolling Friction.

Answer – The Third Law of Rolling Friction states that the rolling friction is inversely proportional to the radius of the curvature and directly proportional to load, it can be written as: F = u x W / r.

FAQs on Rolling Friction

Q: What do you mean by Rolling Friction?

A: The Rolling Friction is described as the force resisting the motion of two rolling surfaces of the objects.

Q: What is the coefficient of Rolling Friction?

A: The coefficient of the Rolling Friction can be described as the relationship between the force of rolling friction and the total weight of the object.

Q: What is the first law of Rolling Friction?

A: The first law of rolling friction states that the smooth surface decreases the force of rolling friction.

Q: What are the factors that cause the friction?

A: The factors are written below:
  • Load
  • Diameter of object
  • Surface area
  • The surface's quality
  • The quality of the sliding object

Q: What is the second law of the Rolling Friction?

A: The second law of the Rolling Friction shows the relation between load and constant that is expressed below: F = kLn
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