Physics

To find the coefficient of kinetic friction between the box and the surface when it moves at a constant velocity, follow these steps:

1. Calculate the weight of the box:

 

2. Calculate the vertical component of the tension force ():

 

3. Calculate the normal force ():

The normal force is the weight of the box minus the vertical component of the tension:

 

4. Since the box is moving at a constant velocity, the net force in the horizontal direction is zero. Thus, the horizontal component of the tension must equal the frictional force ().

 

5. Calculate the horizontal component of the tension force ():