A complex machine.
A train is not a simple machine.
A fulcrum is a part of a simple machine, the lever. Without the fulcrum what is left of the simple machine can no longer increase the applied force and is no longer a simple machine.
yes a door knod is a simple machine
A spade is a simple mechanical (tool) machine.
a slide is an inclined plane
a slide is an inclined plane
inclined plane
inclined plane
a slide is an inclined plane
A "spiral" slide. (Which is really a helical slide . . .)
I don’t know
No, it is an inclined plane, or ramp, another simple machine.
An inclined plane
I don’t know
a small crane made of pulleies and rope
What kind of machine is slide