Question

A box is pressed against a vertical wall by a force F which is directed horizontally. If the magnitude of F is the minimum required to hold the box at rest, what is its value

Answer 1

F = mg /μ

Step-by-step explanation:

For this exercise we define a coordinate system with the horizontal x axis and the vertical y axis, let's write the equilibrium equations for each axis

X axis

F -N = 0

F = N

Y axisy

fr - W = 0

fr = W (2)

the force and touch have the expression

fr = μ N

we substitute

fr = μ F

we substitute in 2

μ F = m g

F = mg /μ