The four polders with their areas of fertile soil would be: (I) North-west polder, area 53,599 acres; fertile soil, 46,189 acres.
A lever (/ËliËvÉr/ or US /ËlÉvÉr/) is a machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum. A lever is a rigid body capable of rotating on a point on itself. On the basis of the location of fulcrum, load and effort, the lever is divided into three types. It is one of the six simple machines identified by Renaissance scientists. A lever amplifies an input force to provide a greater output force, which is said to provide leverage.
Tutorial. 1  Levers are a form of simple machine where a rigid bar can pivot, or rotate, on a fixed point. The fixed point where a lever pivots is called the fulcrum. 2  Levers provide a mechanical advantage to a force that is being exerted. The mechanical advantage of a lever can increase the input force that is being applied to the object and change the direction of the force. There are three types of levers that are classified based on the distance the fulcrum is from the input force.