The total mass of the children and the toboggan is 66 kg. The force the parent exerts is 58 N (18 degrees above the horizontal). What 3 forces/ components do no work on the toboggan?
I said the vertical component of the force being applied, since the displacement and the force will be perpendicular. I also said gravity and the $x$ component of the force being applied since it will also be perpendicular. I don't know any other things that will make work $0$.