Mark correct option or options: (a) Rolling friction always...

Name: Problem 54, Chapter 8: Arihant AIEEE Physics
Uploaded: 2021-10-12T06:43:18-08:00
Duration: 1 min 18 s
Channel: Khoobchandra Agrawal
Description: Mark correct option or options: (a) Rolling friction always oppose the motion of centre of mass of rolling body (b) Sliding friction always oppose the motion of centre of mass of rolling body (c) Rolling friction depends upon hardness of the surface (d) Rolling friction does not depend upon roughness of the surface (e) (a), (c) and (d) are correct

Mark correct option or options: (a) Rolling friction always oppose the motion of centre of mass of rolling body (b) Sliding friction always oppose the motion of centre of mass of rolling body (c) Rolling friction depends upon hardness of the surface (d) Rolling friction does not depend upon roughness of the surface (e) (a), (c) and (d) are correct

Mark correct option or options:
(a) Rolling friction always oppose the motion of centre of mass of rolling body
(b) Sliding friction always oppose the motion of centre of mass of rolling body
(c) Rolling friction depends upon hardness of the surface
(d) Rolling friction does not depend upon roughness of the surface
(e) (a), (c) and (d) are correct

Key Concepts

Surface Hardness

Surface hardness is a measure of a material's resistance to permanent deformation. In the context of rolling friction, harder surfaces usually deform less, which affects the energy losses due to deformation and thereby influences the magnitude of the rolling resistance encountered by a rolling object.

Centre of Mass Motion

The motion of the centre of mass refers to the overall translation of a body’s mass as if it were concentrated at a single point. In dynamics, the net forces acting on the centre of mass determine its acceleration, and different types of friction (sliding or rolling) can influence this motion in distinct ways.

Surface Roughness

Surface roughness describes the fine irregularities and texture of a surface. It can affect the interaction between contacting surfaces by altering the real area of contact and potentially the frictional forces, though in the context of rolling friction, its effects may be secondary compared to deformation characteristics and hardness.

Rolling Friction

Rolling friction is the resistance encountered by a rolling object due to deformations in either the object, the surface, or both. It originates from energy losses, often due to hysteresis in the materials, and its magnitude is influenced by factors such as the deformation characteristics and the hardness of the materials involved.

Sliding Friction

Sliding friction is the resistive force that occurs when two surfaces slide against each other. It acts in the direction opposing the relative sliding motion and is typically proportional to the normal force between the surfaces, with its coefficient determined by the interaction characteristics of the contacting materials.

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