Heavier aircraft have greater inertia and require more acceleration and distance to reach rotation speed.

While often felt as one continuous motion, the FAA divides a normal takeoff into three distinct steps:

Lowering flaps increases lift at lower speeds, allowing for shorter takeoff distances, though it also increases drag. The Three Stages of Takeoff

Thinner air (caused by high temperatures or high altitudes) reduces engine power, propeller thrust, and wing lift, requiring longer runways for takeoff.

This article explores the mechanics, physics, and critical safety procedures of an aircraft's takeoff. The Anatomy of a Takeoff: Science, Safety, and Skill