Forces and matter GapFill

Forces can result in objects changing shape, known as deformation, which can be either stretching, bending or compressing the object. When the relationship between the force exerted on an object and the change in the object's shape is linear (produces a straight line graph), there is  non-proportionalproportionalinelasticelastic deformation. After a point known as the  limit of linearitylimit of deformationlimit of worklimit of proportionality, less force is required to produce an extension of the same size, so the relationship is not linear; this is known as  inelasticproportionalelasticnon-proportional deformation. A fluid is a substance that can flow and fill a container, and can be a liquid or a gas.

A fluid exerts a pressure on the container it is contained in, or on any object in the fluid; pressure is given by the equation P =  area ÷ forceforce ÷ area²force × areaforce ÷ area, and is measured in  pascalswattsnewtonsjoules. The pressure exerted by a fluid on a submerged object is given by the equation P =  hρghg ÷ ρρg ÷ hhρ ÷ g, where ρ is the density of the fluid, h is the height of the fluid above that point, and g is gravitational field strength.