Wedge

A wedge is a modification of the inclined plane. Unlike an inclined plane a wedge can move.

Did you know?
Wedges are used to split granite!
A simple device called a wedge and feather can split huge granite blocks.

A wedge can have a single or two sloping surfaces. The effort you need depends on the relationship between the length and width of the wedge and consequently the sloping surface.

Common examples of wedges include axes, knives and doorstops.

Build the following models. Use the Contemplate ideas below and on the Student Worksheet to learn about each model, one at a time.

Build E1 book II, page 16 to 25

E1
This model shows a single wedge with a long sloping surface, which presents a mechanical advantage of approximately 3. The wedge needs a small effort to lift the load as the wedge has a small angle.

E2
This model shows a single wedge with a short sloping surface, which presents a mechanical advantage of 1.3. The steep angle of the sloping surface needs a greater effort to lift the load compared to the previous wedge. But it also travels a shorter distance.