Question

wedge is a machine. justify

Answer 1

Wedge is a classical simple machine. The mechanical advantage of the wedge is given by the ratio of its length of its slope to its width.

Answer 2

A machine is an artificial system which is developed to do certain things by applying some amount of power as the input of that machine,to perform any sort of physical work as the output.

But a wedge is simply a piece of metal which we insert in various surfaces for different purposes.

It doesn't perform any physical work as the output, that's why we cannot consider it as a machine.