A bike is not a simple machine. It's a collection of several simple machines ... specifically, in order to even be a "bicycle" it must contain at the very minimum two simple machines (two wheels and axles).
only trained personnel should operate the simple machine
A wedge is a simple machine. A bike is not considered a simple machine because it is composed of many complex systems working together to enable motion.
Operate. I can operate that very simple machine.
That isn't a simple machine, it is a complex machine, made up of other simple machines.
force?
In order to operate a binding machine you do not need special training. It is pretty simple to operate.
Wheel and axle
Gears on a bike are a type of wheel and axle simple machine. As the pedals turn the circular motion into rotational motion, the gears on the bike increase or decrease the force needed to propel the bike forward.
The force that a simple machine applies is called effort force. It is the force that is applied to operate the machine and overcome resistance.
The force applied to a simple machine is called effort/input force.
A bike is a simple machine, because it has a wheel and axle.
put your legs on the peddles and peddle