A lever! The most simple would probably be a form of lever, and this may also depend on the actual size of the "heavy rock".
pulley
A simple machine that was used my Egyptians would be a lever or any type of lever that would help them to lift heavy materials while building the pyramids.
Wheels and axles are typically found on the bottom of a wagon. They reduce friction between the wagon and the ground, making it easier to move heavy loads.
A pulley
That isn't possible, not with a simple machine and not with a complicated machine, since otherwise, conservation of energy would be violated.
no
a wedge
No. Gears are a type of simple machine. Combined with another simple machine, it would then make a compound machine.
A screw is the simple machine which holds two boards together. In this case it is not acting as a machine though.
a complex machine would be a car, but a simple machine would be a wheel and axle. an example of a wheel and axle would be a steering wheel
Yes, a hovercraft is considered a simple machine because it uses principles of physics like air pressure to generate lift and propel itself forward. It does not have complex mechanisms like gears or engines.
It's a tool