Does the Engine Help Boats to Float?

The ability for humans to build and use boats that can float over water enables people to explore the globe, travel to various locations and gather resources from oceans. Many ancient cultures were able to travel across water by developing platforms and boats that were capable of floating. In addition to floating, modern technology has allowed humans to also install engines on the boats to enhance their speed and power.

  1. Engines

    • All boats require that a source of power is supplied to successfully propel the boat into motion over the water. In small boats, the power source can be supplied by people using oars or paddles. Engines, on the other hand, are used to generate power for fast motorboats and large ships. The engines convert gasoline and fuel into energy, and the energy is then used to stimulate a propeller to wade through the water and enable the boat to move forward over the water. This is especially helpful for boats that are intended to travel at high speeds and large ships designed to carry large amounts of people or cargo.

    Floating

    • Engines offer a valuable function to boats, but they do not help boats float on top of water. Although the engine provides the power required to propel and move certain boats forward and across vast stretches of water, the engine does not help the boat to remain afloat and engines are not required to help boats float. Instead, boats float as a result of the shape and density of their structures.

    Density

    • Density refers to the amount of matter and weight per volume of space for a given object. If any object is more dense than the water beneath it, then it will sink. However, if an object has a lower density than the water beneath it, then the weight of the object will create an "upthrust" motion, which enables the water beneath it to push upward with a force equal to the weight of the object. The lower density causing this upthrust motion allows certain objects to float. Thus, although boats can be rather heavy, boats are built with a very spacious structure that features an abundance of open air on the interior of the structure. As a result, boats are generally less dense than the water beneath them, which enables the boats to remain afloat on top of the water as they travel.

    Ships

    • Because engines are not required to help boats float, many small boats can remain afloat despite not having engines, such as sailboats, rowboats, canoes and kayaks. Such boats can float because they feature lower densities than the water beneath them, and enormous cargo and cruise ships also can float by the same principle. Thus, when the engine of a large ship is turned off, the ship can still remain afloat due to the shape of its structure. When the engine is off, the ship continues to float on the water as it moves slightly according to the current and bobs up and down.