Identify the correct statement. (a) Static friction depends...

Name: Problem 53, Chapter 5: Objective NCERT at your FINGERTIPS: Physics
Uploaded: 2021-10-03T15:47:36-08:00
Duration: 2 min 8 s
Channel: Dheeraj Sharma
Description: Identify the correct statement. (a) Static friction depends on the area of contact. (b) Kinetic friction depends on the area of contact. (c) Coefficient of static friction does not depend on the surfaces in contact. (d) Coefficient of kinetic friction is less than the coefficient of static friction.

Identify the correct statement. (a) Static friction depends on the area of contact. (b) Kinetic friction depends on the area of contact. (c) Coefficient of static friction does not depend on the surfaces in contact. (d) Coefficient of kinetic friction is less than the coefficient of static friction.

Identify the correct statement.
(a) Static friction depends on the area of contact.
(b) Kinetic friction depends on the area of contact.
(c) Coefficient of static friction does not depend on the surfaces in contact.
(d) Coefficient of kinetic friction is less than the coefficient of static friction.

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Key Concepts

Area of Contact in Friction

In the classical model of friction, particularly when using Coulomb's laws, the frictional forces are independent of the apparent area of contact. This is because the frictional force is proportional to the normal force and a coefficient that is inherent to the surfaces, rather than the size of the contact area.

Coefficient of Friction

The coefficient of friction is a dimensionless scalar which represents the frictional properties between two surfaces. There is a coefficient for static friction and one for kinetic friction, and their values depend solely on the materials and conditions of the surfaces, not on the contact area.

Static Friction

Static friction is the force that resists the initiation of sliding motion between two surfaces in contact. It is usually greater than kinetic friction because it needs to overcome the initial resistance to motion. The static friction force is determined by the nature of the surfaces and the normal force rather than the contact area.

Kinetic Friction

Kinetic friction is the force that acts against the motion of sliding surfaces after they have overcome static friction. It is typically lower than static friction and is also dependent on the nature of the surfaces and the normal force. Like static friction, it does not depend on the area of contact in idealized models.

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