How do man-o-wars move?
Portuguese man o' war
The Atlantic Portuguese man o' war lives at the surface of the ocean. The gas-filled bladder, or pneumatophore, remains at the surface, while the remainder is submerged.[6] As the Portuguese man o' war has no means of propulsion, they move according to the winds, currents, and tides. Although they are most commonly found in the open ocean in tropical and subtropical regions, they have been found as far north as the Bay of Fundy, Cape Breton and the Hebrides.[7]
Tug of war
Aside from the raw muscle power needed for tug of war, it is also a technical sport. The cooperation or "rhythm" of team members play an equally important role in victory, if not more, than their physical strength. To achieve this, a person called a "driver" is used to harmonize the team's joint traction power. He moves up and down next to his team pulling on the rope, giving orders to them when to pull and when to rest (called "hanging"). If he spots the opponents trying to pull his team away, he gives a "hang" command, each member will dig into the grass with his/her boots and movement of the rope is limited. When the opponents are played out, he shouts "pull" and rhythmically waves his hat or handkerchief for his team to pull together. Slowly but surely, the other team is forced into surrender by a runaway pull. Another factor that affects the game that is little known are the players' weights. The heavier someone is, the more static friction their feet have to the ground, and if there isn't enough friction and they weigh too little, even if he/she is pulling extremely hard, the force won't go into the rope. Their feet will simply slide along the ground if their opponent(s) have better static friction with the ground. In general, as long as one team has enough static friction and can pull hard enough to overcome the static friction of their opponent(s), that team can easily win the match.