Pivots, Fulcrum etc.

Homework

Using the three classes of levers give two examples of each identifying the relative position of the fulcrum, load and effort. Pictures must be present for the examples.

First Class Levers
First class levers are those levers with the pivot (fulcrum) between the load and the effort. Some examples are :

Pliers
In pliers, the fulcrum/pivot is in the middle, in the form of a screw, the load is put between the two pinchers and the effort is applied at the handle.

Scissors
In scissors, the fulcrum is the screw in the middle, the effort is applied at the handles and the load is cut by the cutting ends of the scissors.

Second Class Levers

A second class lever is a lever that has the load is between the fulcrum and the effort. Some examples are :
Wheelbarrow
In the wheelbarrow, the load is carried in the middle between the fulcrum and the effort. In a wheelbarrow the load is carried in the “bed”, the pivot is in the wheel and the effort is applied to the handles.

Door
In a door the load is the actual door (wood), the pivot is the door hinge and the effort is applied to the handle.

Third Class Levers
Levers in this class have the effort in the middle between the fulcrum and load.

Tongs
In the tong, the effort is applied in the middle portion, the fulcrum is the closed end and the load is held between the pinchers.

Staple Remover

In the staple remover, the effort is applied in the middle part, the pivot is at the rounded end and the load (the staple) is gripped with the claws.