Pianistimo you are wrong. all machines respond to violence. repeat after me,
ALL MACHINES RESPOND TO VIOLENCE
You have not made the correct mental leap here.
Pianistimo (hope you are not offended) is posting about a very specific machine in very cookbook methodology.
She does not understand machines in general and does not generalize basic principles from the wash machine to the toaster.
Using a violent approach is a conceptual level of generalization one step above, but it is ultimately flawed as well. You are coming up with a common approach for a common class of machines, but it is not based on any of the underlying principles of function.
I will give you a simple test to tell whether you understand machines or not.
How much does the vending machine owe you?
When I was about $4.50 AHEAD!, I decided to become a mechanical engineer.