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A tow line to hold on to, something to tie the tow line on to on the boat and a handle.
A personal floatation device
A boardrider is another term for a surfer, or a person who rides on a surfboard.
being towed behind a PWC with an operator and an observer on board
A Personal Floatation Device.
A flotation device for every person
Personal Flotation Device
A personal floatation device
I think flotation device and 1 safety vest per person are required.
Instead of using a vice, a person could use a monkey wrench or any type of clamping device. Additionally, a person's hands will work if the pressure required is low.
They may be carrying a surfboard. Perhaps they might have a tube. Or most likely of all, one of those big megaphones they use to yell at people. Its only for the peoples safety, though. Family Feud: Whistle, Life preserver, towel, surfboard, person
An example of a device that can change the size of the force required to do work is a pulley system. By using different arrangements of pulleys, a person can change the mechanical advantage and effectively decrease the amount of force needed to lift an object. This allows the person to do work more easily by exerting a smaller force over a longer distance.