All of the following show friction as a useful force, except
the heat energy produced when two surfaces rub together
having to push a rough and heavy box across the floor to move it
the friction between your feet and the floor keeping you from slipping
the tread on tires the moving vehicle slow down and stop when necessary

having to push a rough and heavy box across the floor to move it

Explanation:

The Friction force is any force that is in opposite direction of the motion of an object or fluid due to the contact of this object or fluid with other bodies.

In this sense, there are different types of friction force thath are useful in different situations:

-The Static friction force prevents surfaces from slipping across each other. For example, the friction between your feet and the floor keeping you from slipping.

-The kinetic friction force as the force that helps the tires in a moving vehicle to slow down and stop when necessary.

However, if you want to push a heavy box across the floor to move it, the friction force will not be useful at all.

b) 10 minutes

girls stopped for 10 minutes.