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.
Simply put, levers are machines used to increase force. We call them simple machines because they have only two parts â the handle and the fulcrum. The handle or bar of the lever is called the arm â it's the part that you push or pull on. The fulcrum is the point on which the lever turns or balances. In the case of a fork, the fulcrum is the fingers of your hand. Scissors are really two levers put together. The handle on the toilet flusher is commonly called a fixed lever. Take a quick look around you and see how many levers you can find.