A wedge
A door stopper is a wedge because it's thin at one end and larger at the other end which stops the door.
It can be just a heavy mass. I have what looks like a toy elephant, stuffed with sand.
What kind of simple machine is a garage door
It's a simple lever.
What kind of simple machine is a garage door
screw:D
pulley
A pulley isn't a kind of simple machine, it is a simple machine
A train is not a simple machine.
IT's NOT A SIMPLE MACHINE!
its not a simple machine
It is a simple lever.
Rope is not a simple machine on its own, it's a simple machine on a wheel and axle, then it's a pulley.
What kind of simple machine is a garage door
a compound machine is a combination of simple machines
lever
lever
It's a simple machine.
A lever