The boys, engineering their wagon/tricycle mobile command center. Ben had a wagon, a tricycle and two bungee cords. He devised a system to hook the wagon to the tricycle and pull the wagon. I didn't get a picture/video of it, but when one of the other kids was having trouble peddling the trike to pull the wagon so Ben went over to have a look-see. He first observed and corrected the wagon wheels. He straightened them so they they were in the correct forward motion position. He then adjust the bungee's a bit so they were level between the trike and wagon. He then told Nick to move to the back seat, further away from the trike because he couldn't pull him if he were in the front seat. He then hopped on the trike and away he want, no problem, pulling his brother in the wagon. I was very impressed by the wheel assessment/straightening and the weight distribution logic.
Two forces of equal and opposite magnitude...can't end well.
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