Question

Un bloque de 8 kg descansa sobre una superficie horizontal cuyos coeficientes de fricción son: s = 0.4 y k = 0.2. La fuerza máxima que se le puede aplicar al bloque para que no se mueva es:

An 8 kg block rests on a horizontal surface whose coefficients of friction are: s = 0.4 and k = 0.2. The maximum force that can be applied to the block so that it does not move is:

Answer 1

The block will only move, once the force applied overcomes the resistance due to the static friction. Since the block is not moving, until the maximum force is applied, we only consider the static friction to calculate the maximum force.

Balancing the forces on the block in the above figure,

F_{​​​​​Max} = F_{​​​​​​static friction}

F_{​​​​​​Fstatic} = _static mg = 0.4 x 8 x 9.8 = 31.36N

=> Maximum force that can be applied = 31.36 N