What is the force required to keep the object sliding on a surface with the same speed?

Correct option is A

The correct answer is (a) Sliding friction.
· Sliding friction is the force that opposes the motion of an object as it slides over a surface.
· This type of friction occurs once the object is in motion, unlike static friction which acts when the object is stationary.
· To keep an object sliding at a constant speed, the applied force must balance out the sliding friction. The amount of sliding friction depends on the surface texture and the nature of the object.
· Sliding friction is generally less than static friction but more than rolling friction.
· It converts some kinetic energy into heat, which is why surfaces can warm up during sliding.
Additional Knowledge:
· Static friction: The force that must be overcome to start the motion of an object. It is usually higher than sliding friction.
· Rolling friction: The resistance that occurs when an object rolls over a surface, typically much lower than sliding friction.
· Contact friction: A general term that refers to any frictional force between two surfaces in contact, whether they are sliding, rolling, or stationary.