Question:

The limiting friction is

Updated On: Aug 1, 2022
  • always greater than the dynamic friction
  • always less than the dynamic friction
  • equal to the dynamic friction
  • sometimes greater and sometimes less than the dynamic friction
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The Correct Option is A

Solution and Explanation

The maximum value of the force of friction which comes into play before a body just begins to slide over the surface of another body is called limiting friction. Force of friction acting between the two surfaces, when one surface is in steady motion over the other surface, is called dynamic friction. The dynamic friction is always less than the limiting static friction.
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Concepts Used:

Friction

Friction is defined as the resistance offered by the surfaces that are in contact when they move past each other.

Types of Friction

There are four categories of Friction- static friction, sliding friction, rolling friction, and fluid friction. 

Sliding Friction

In Sliding Friction, the weight of the sliding object calculates the amount of sliding friction present between the two objects. The sliding friction is supposed to be greater as the pressure exerted by the heavy object on the surface it slides over is comparably more. 

Rolling Friction

Friction between a circular object and the surface is called as Rolling Friction. It is required to overcome sliding friction is more than the force required to overcome the rolling friction. 

Static Friction

Friction that keeps an object at rest without initiating any relative motion between the body and the surface is termed as Static Friction. For example, a parked car resting on the hill, a hanging towel on the rack. The maximum force of static friction is directly proportional to the normal force.

Fluid Friction

Fluid Friction is the kind of friction that is exerted by the fluid on the object that is moving through a fluid.