Science Olympiad Simple Machines Practice Test 2026 - Free Simple Machines Practice Questions and Study Guide

An inclined plane is a flat surface that is tilted at an angle to help raise or lower objects with less effort. This makes it easier to move loads vertically, utilizing the force of gravity to facilitate the movement.

The ramp used for loading cargo exemplifies an inclined plane because it creates a slope that allows heavy items to be rolled or pushed up to a higher elevation with reduced force. By climbing the ramp, the effort required to lift the cargo directly against gravity is lessened, making loading and unloading much more efficient.

The other options do not represent inclined planes. A seesaw is a lever that pivots around a fulcrum and is not a flat surface inclined at an angle. A wheelbarrow involves both levers and a wheel axle to help transport loads but does not have the primary function of an inclined surface. Scissors are a tool that uses levers to cut, rather than an inclined surface for lifting or lowering objects.