lever
A lever
The lever.
Lever Hoist
Simple machine help us do work like lifting heavy things that we cant lift. This was done by an 8th grader at berea middle school.
It was 270 pounds but who was it
pulley
A lever
The lever.
the wheelbarrow.
A pulley.
Lever Hoist
An inclined plane is a simple machine that is used to load heavy objects!
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".
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.
A pulley is a simple machine that helps you carry heavy objects without using a large amount of force.
Wheel and axle
A pulley