The box can be moved from its place if a force of at least 60 N. is applied to it.

The box can be moved from its place if a force of at least 60 N. is applied to it. determine in SI the force with which the box presses on the floor if the coefficient of friction between the box and the floor is 0.3.

Given:

F = 60 Newton – the force that needs to be applied to move the box from its place;

k = 0.3 – coefficient of static friction;

g = 10 m / s ^ 2 – acceleration of gravity.

It is required to determine the force with which the box presses on the floor P (Newton).

According to Newton’s first law, a box can be moved from its place when the force applied to the box becomes equal to the force of friction at rest, that is:

F = Ftr;

F = k * N, where N is the support reaction force, numerically equal to the body weight P, N = P.

k * P = F;

P = F / k = 60 / 0.3 = 200 Newtons.

Answer: the box presses on the floor with a force of 200 Newtons.