coumpound machine
Compound machines are things that are made up of 1 or more simple machines. A screw isn't made up of any simple machines unless you count the screw as a simple machine.
plastic can be made into simple machines, but no plastic itself isn't a simple machine.
A compound machine.
compound machine
a pulley
A compound machine.
compound machine
That isn't a simple machine, it is a complex machine, made up of other simple machines.
compound machine
A complex machine.
A compound machine.
it is made up of two or more simple machines