Select all the correct statements.

The normal force and the force of gravity cannot have the same direction.

For impending motion, vec$(f{)}_{s_{\text{m}\text{a}\text{x}}}={}_s$vec$(F{)}_n.$

As you lower a bucket into a well using a rope, the force of tension in the rope must be smaller than the force of gravity acting on the bucket.

The expression $F=\frac{md}{t^2}$ is dimensionally correct have the usual meaning$).$

For an object to be at rest, the net force acting on it must be zero.