A pair of scissors is a compound simple machine that uses levers to force wedges (scissors blades) onto something to cut it.

Many machines have many simple machines as parts of them.  Can you find many machines in these examples?
 
 

A great activity with kids is to bring in a bicycle and look at the simple machine that are a part of it.  How many examples of simple machines can you find on a single bicycle?  What does each one do?