What characterizes free fall?

Free fall is characterized by the motion of an object solely under the influence of gravity. In this scenario, the object accelerates downward at a constant rate, which on Earth is approximately 9.81 m/s². During free fall, there are no other forces acting on the object, such as air resistance, which distinguishes it from other types of motion where multiple forces may be at play.

The other options describe different scenarios. While constant speed indicates no acceleration, it doesn't apply to free fall, where speed changes as the object falls. Additionally, air resistance affects falling objects and applies only when they are not in free fall, as it introduces a force that opposes gravity. Lastly, uniform motion in a circular path involves centripetal forces and is unrelated to the linear motion demonstrated in free fall. Thus, the essence of free fall lies in its definition as the motion of an object under gravitational influence without any other forces acting upon it.