What type of friction is not affected by the speed of the body?

Static friction is characterized by its role in preventing an object from starting to move when a force is applied to it. It operates between surfaces that are not in relative motion and acts up to a certain threshold—specifically, the maximum static friction force must be overcome for the object to begin moving.

One key aspect of static friction is that it does not depend on the speed of the object since it only comes into play when forces are applied but no motion has occurred. The resistance it offers remains constant up to its maximum limit, which is determined by the nature of the surfaces in contact and the normal force, rather than the speed at which a potential motion could occur.

In contrast, kinetic friction, which applies when two surfaces are sliding against each other, often has a constant value but can be affected slightly by speed, especially in specific conditions where temperature changes (due to frictional heat) alter the properties of the materials involved. Rolling friction and fluid friction also demonstrate variations with speed, influenced by factors such as viscosity or the deformation of surfaces.

Therefore, static friction's independence from speed, combined with its fundamental role in the initial resistance to motion, makes it the correct choice in identifying a type of friction not affected by the speed of the body.