What kind of simple machine is a flour sifter?

Sieves are a simple machine that works by separation. They have a mesh or screen that allows smaller particles to pass through while retaining larger particles.

Here's how a flour sifter applies this principle:

* Mesh: The flour sifter has a mesh screen at the bottom.

* Separation: When you shake the flour sifter, the flour passes through the mesh, leaving any lumps or larger particles behind.

So, although it looks like a simple kitchen tool, a flour sifter is a working example of a sieve, a basic simple machine.