Which of the following is true? (a) Rolling friction appears...

Which of the following is true? (a) Rolling friction appears due to deformation at the point of contact (b) All perfectly rigid wheels experience rolling friction (c) For identical surface in contact coefficient of static friction $>$ coefficient of sliding friction (d) Friction is component of total contact force parallel to surface of contract

Which of the following is true?
(a) Rolling friction appears due to deformation at the point of contact
(b) All perfectly rigid wheels experience rolling friction
(c) For identical surface in contact coefficient of static friction $>$ coefficient of sliding friction
(d) Friction is component of total contact force parallel to surface of contract

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Key Concepts

Rolling Friction

Rolling friction refers to the resistance encountered when a round object, such as a wheel or ball, rolls over a surface. It primarily arises due to deformations either in the rolling object or in the surface at the point of contact. This deformation causes energy to be lost, typically as heat, which results in a force that opposes the rolling motion.

Static and Kinetic (Sliding) Friction

Static friction is the force that resists the initiation of sliding motion between two surfaces in contact, while kinetic or sliding friction acts when there is relative motion between the surfaces. In many cases, the coefficient of static friction is larger than that of kinetic friction, meaning that more force is needed to start the motion than to maintain it once it has begun.

Contact Force Decomposition

In mechanics, the total contact force between two surfaces can be decomposed into a normal component, which acts perpendicular to the surfaces, and a frictional component, which acts parallel to the surface. The frictional component is responsible for resisting the sliding or rolling motion. Understanding this decomposition is crucial for analyzing scenarios where friction plays a role in motion.

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