Final answer:
An object is in free fall when gravity is the only force acting upon it. All objects in free fall accelerate at the same rate due to gravity, regardless of their mass, and this can be analyzed using free-body diagrams and kinematic equations.
Step-by-step explanation:
When an object falling without any other influence than gravity, it is said to be in a free fall situation. In this scenario, the only force acting on the object is gravity. This is a noteworthy example of motion where all objects, regardless of their mass, experience the same constant acceleration due to gravity when air resistance and friction are negligible. In the context of physics problems, understanding free fall is crucial when analyzing the motin of objects under the influence of gravity alone.
A free-body diagram is a useful tool in these situations. It is a sketch that shows all external forces acting on an object or system. The system is represented by a single isolated point, and the forces are represented by vectors extending outward from that point. This diagram helps to visualize and calculate the forces in play, particularly the gravitational force represented by the equation W = mg, where W is the weight, m is the mass, and g is the acceleration due to gravity.
In a free fall, the acceleration of a falling objects is called acceleration due to gravity. This acceleration is constant, allowing us to apply kinematic equations to predict the motion of the falling object. Yet in reality, objects are rarely in true free fall because air resistance exerts an upward force. However, the concept is critical for understanding the fundamental principles of physics.