Question

The limiting friction is
A. Always greater than the dynamic friction
B. Always less than the dynamic friction
C. Equal to the dynamic friction
D. Sometimes greater and sometimes less than the dynamic friction

Answer 1

Hint: In this question, we have been asked to determine the relationship between limiting friction and dynamic friction. To solve this question one needs to know what limiting and dynamic friction are. Once we have studied the properties of both types of friction by comparing them to the four options, we can determine what the final answer will be.

Complete step by step solution:
Limiting friction:
There is a limitation to the amount of friction that is applied between two objects. So when the applied force is just large enough, the object will begin to move. Therefore, we can mention limiting friction as the maximum amount of static friction that comes into play, at the moment when the body is sliding over the surface of another body.
Dynamic friction:
This is the friction that is present between two objects that are in motion with respect to each other.
While limiting friction is the maximum of static friction that comes into play when the object is just about to slide over the other object, dynamic friction is friction that exists between two objects that are in motion. From this, we can imply that limiting friction is always greater than dynamic friction.
Therefore, option A is correct.

Note:
In the above discussion, we have discussed both the properties of limiting and dynamic friction in detail. We have then concluded that limiting friction is always greater than dynamic friction. The force that opposes the motion of an object is mentioned as friction. This force acts opposite to the direction of the applied force. This force occurs between the surface areas of two bodies in contact.