Is a bow and arrow a machine?

First answer: it is not a machine

Second answer: as crowbar is thought to be a machine, I´d say a bow is a machine too. The definition of a machine is:

a. A device consisting of fixed and moving parts that modifies mechanical energy and transmits it in a more useful form.

b. A simple device, such as a lever, a pulley, or an inclined plane, that alters the magnitude or direction, or both, of an applied force; a simple machine.

Do note, the bow is the machine, the arrow is not.