Question

Limiting friction is greater than ______ friction.
A. Kinetic
B. rolling
C. both
D. none

Answer 1

Hint: The maximum friction that can be produced between two static surfaces that are in contact with each other. Once a force is applied to the two surfaces which when exceeds the limiting friction, the motion will happen. For the two dry surfaces, the limiting friction is defined as a product of the normal reaction force and the coefficient of limiting friction.

Complete step by step solution:
Limiting friction is defined as the maximum value of static friction that will come into action when a body is just near a point of sliding over the surface of another body. Let us look at an example. Pushing a heavy box that is resting on a floor with a small force to make a movement horizontally. In short, static friction is the same as the force being applied because the body isn't moving. Static friction is acting due to the body tends to move when a force is acting on it. Limiting friction is the friction acting on a body when it is about to start moving. Commonly, limiting friction is the highest.
${{\mu }_{s}}>{{\mu }_{k}}$
Where ${{\mu }_{s}}$ the coefficient of limiting friction and ${{\mu }_{k}}$ is the coefficient of kinetic friction.
Hence the correct answer is option A.

Note: Static friction is defined as the force that will help an object to be at rest. Static friction is the friction felt when individuals are trying to move a stationary object on a surface, without actually making any relative motion between the body and the surface which it is on. Rolling resistance often known as rolling friction or rolling drag is the force resisting the motion if a body rolls on a surface. It is mainly due to non-elastic effects.