When the box is moved on a horizontal floor, a friction force of 80 N is generated.

When the box is moved on a horizontal floor, a friction force of 80 N is generated. Determine the weight of the box if the coefficient of friction is 0.04.

Initial data: Ftr. (sliding friction force when moving the box on a horizontal floor) = 80 N; μ (coefficient of friction between the material of the box and the material of the floor) = 0.04.

Since the sliding friction force acting on the box can be calculated by the formula: Ftr. = μ * N = μ * P, then the weight of the box will be equal to P = Ftr. / μ.

Let’s perform the calculation: P = 80 / 0.04 = 2000 N = 2 kN.

Answer: The weight of the box is 2 kN.