Final answer:
Workers building pyramids in ancient Egypt used an inclined plane as a simple machine to move heavy stones out of the way of the ramp they were constructing.
Step-by-step explanation:
Workers building pyramids in ancient Egypt used an inclined plane as a simple machine to move heavy stones out of the way of the ramp they were constructing. An inclined plane, such as a ramp, reduces the amount of force needed to move an object vertically by increasing the distance over which the force is applied. By using an inclined plane, the workers could roll the stones along the ramp with less effort than if they had to lift them straight up. This allowed them to efficiently move the stones and construct the pyramids.