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Archimedes's Principle

An object is subject to an upward force when it is immersed in liquid. The force is equal to the weight of the liquid displaced. The apparent weight of a block of aluminium (1) immersed in water is reduced by an amount equal to the weight of water displaced. If a block of wood (2) is completely immersed in water, the upward force is greater than the weight of the wood. (Wood is less dense than water, so the weight of the block of wood is less than that of the same volume of water.) So the block rises and partly emerges to displace less water until the upward force exactly equals the weight of the block.

 

 

Parallelogram

Parallelogram, in plane geometry, a four-sided polygon, or quadrilateral, in which each side is equal in length to its opposite side, and the opposite sides are parallel to each other. Three special kinds of parallelogram are the square, in which all four sides are equal in length and meet at right angles; the rectangle, in which only opposite sides are equal in length but all sides meet at right angles; and the rhombus, in which all sides are equal in length but do not necessarily meet at right angles. Area is the product of one side, taken as base, times the shortest distance to the opposite side. See also Vector.


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