The last two examples are simple machines. See the links for pix.
A lever
A lever
yes
lever
the law of the machine is an expression which gives the relationship between the load on a machine and the applied effort
An airplane is not a simple machine. A lever is a simple machine. A wheel is a simple machine. Any machine that can be described by a mathematical formula is a simple machine.
A pulley isn't a kind of simple machine, it is a simple machine
simple machine
Its a simple machine which can crush any complex machine
yes it is a simple machine... the wind blowing on the wheel and axle makes it a simple machine
yes , its a simple machine
A simple machine.