A cube slides down the surface of a ramp at a constant velocity. What is the magnitude of the frictional force that acts on the cube due to the surface?

The component of weight of the cube parallel to the plane

Explanation:

From the question we are told that

Cube slides at constant speed

Generally the equation for frictional force is given by

where

Generally the equation fo Normal force is mathematically given as

Therefore

Generally at constant velocity frictional force f will be

Therefore

The magnitude of the frictional force that acts on the cube due to the surface is the component of weight of the cube parallel to the plane