At rest, the object is taken to be in static equilibrium.

The first condition for the object to be at the static equilibrium is that the net force must be zero,

For an object to be in static equilibrium, the net force must be equal to zero and,

a) The moment of inertia must be zero.

b) The net torque must be equal to zero.

c) The center of gravity must be above the support point.

d) The normal force must equal the weight.