The laws of momentum. The boat is on a frictionless surface (water). The engine turns the propeller, which forces water backwards at speed. Since there is nothing to stop the boat moving - it moves forwards.
Bag speakers can be used on a boat, however watch for water leakage on the speakers. The bag will protect from much of the water leakage, and are safe to take on a boat.
A boat or ship.
Boat
An anchor is used to stop a boat from drifting. It is a heavy object that is dropped to the bottom of the water to hold the boat in place.
A boat floats in water due to the principle of buoyancy, where the weight of the water displaced by the boat is equal to the weight of the boat itself. To help a boat float, it needs a shape that displaces enough water to support its weight. The design of the boat, including its hull shape and materials used, all contribute to its ability to float effectively.
Sail is a sheet of material used to propel a boat. - Or to move on the water in such a boat.
Any force can be used to make something move. It is kind of the nature of forces.
boat
Water is used through recreation during sports such as; swimming, water skiing, and boat riding.
Boat motors work by converting fuel into mechanical energy, which is used to turn a propeller. The propeller then pushes water backwards, creating a force that propels the boat forward.
Viking longships, starting in the 700s AD, had a mast with a sail. To make a boat with a sail stable, a keel is needed to counteract the tipping forces the wind places on the sail. Prior to the sail being added, longships did not require or have keels.