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Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces and acts in the upward direction at the center of mass of the displaced fluid.

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The buoyant force comes from the pressure exerted on the object by the fluid. Because the pressure increases as the depth increases, the pressure on the bottom of an object is always larger than the force on the top - hence the net upward force. The buoyant force is present whether the object floats or sinks.

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The pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101,325 pascals (roughly 14.6959 pounds per square inch).

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he SI unit of pressure, equal to one newton per square meter (approximately 0.000145 pounds per square inch, or 9.9 × 10⁻⁶ atmospheres).

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The continuous physical force exerted on or against an object by something in contact with it.

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A substance that has no fixed shape and yields easily to external pressure; a gas or (especially) a liquid.

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A tendency to do nothing or to remain unchanged.

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And an object which is thrown upward at an angle to the horizontal is also a projectile (provided that the influence of air resistance is negligible). A projectile is any object that once projected or dropped continues in motion by its own inertia and is influenced only by the downward force of gravity.

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Downward movement under the force of gravity only.

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The constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration.

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A coherent, typically large body of matter with no definite shape.

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A body's relative mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing.

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The force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.

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The resistance that one surface or object encounters when moving over another.

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A net force is defined as the sum of all the forces acting on an object. The equation below is the sum of N forces acting on an object. There may be several forces acting on an object, and when you add up all of those forces, the result is what we call the net force acting on the object.

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The SI unit of force. It is equal to the force that would give a mass of one kilogram an acceleration of one meter per second per second, and is equivalent to 100,000 dynes.

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Strength or energy as an attribute of physical action or movement.

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Increase in the rate or speed of something.

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The speed of something in a given direction.

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The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.

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The action or process of moving or being moved.

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A complex organic substance present in living cells, especially DNA or RNA, whose molecules consist of many nucleotide's linked in a long chain.

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Any of a class of nitrogenous organic compounds that consist of large molecules composed of one or more long chains of amino acids and are an essential part of all living organisms, especially as structural components of body tissues such as muscle, hair, collagen, etc., and as enzymes and antibodies.

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Any of a class of organic compounds that are fatty acids or their derivatives and are insoluble in water but soluble in organic solvents. They include many natural oils, waxes, and steroids.

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Any of a large group of organic compounds occurring in foods and living tissues and including sugars, starch, and cellulose. They contain hydrogen and oxygen in the same ratio as water (2:1) and typically can be broken down to release energy in the animal body.

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An organic compound is any member of a large class of gaseous, liquid, or solid chemical compounds whose molecules contain carbon.