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A paintbrush is not a machine in the sense that the word "machine" is used in elementary physics. Machines are used to do work, usually by providing leverage in some way.
In that way, Atwood's machine, a collection of ropes and pulleys, is a machine, but the gasoline engine is not.
This is merely an issue of terminology and classification and has historical roots. It is not a statement of a basic law of science.
What else can I help you with?
What kind of lever is paint can opener?
it is a 2nd class lever
Which is a type of simple machine?
A pulley isn't a kind of simple machine, it is a simple machine
What kind of simple machine is a train?
A train is not a simple machine.
What kind of simple machine is a bottle top?
IT's NOT A SIMPLE MACHINE!
What kind of simple machine is a basketball hoop?
its not a simple machine
What kind of simple machine is a broom?
It is a simple lever.
What kind of simple machine is ROPE?
Rope is not a simple machine on its own, it's a simple machine on a wheel and axle, then it's a pulley.
A combination of simple machines is what kind of machine?
a compound machine is a combination of simple machines
Kind of simple machine?
lever
What kind of simple machine?
lever
What kind of machine is an inclined plane?
It's a simple machine.
What kind of simple machine machine is a baseball bat?
A lever
