* Free Fall: When an object falls under the influence of only gravity, without any other forces like air resistance acting upon it.
Key Points:
* Constant Acceleration: In free fall, the object accelerates at a constant rate due to gravity. This acceleration is approximately 9.8 m/s² on Earth.
* Neglecting Air Resistance: The concept of free fall is an idealized situation where we ignore the effects of air resistance (friction). In reality, air resistance plays a significant role in how objects fall.
* Vacuum: To achieve true free fall, the object needs to be in a vacuum where there is no air.
Examples:
* Objects Falling in a Vacuum Chamber: A classic example is dropping objects in a vacuum chamber, where air resistance is eliminated.
* Objects Falling from a Great Height (Initially): When an object falls from a very high altitude, its initial acceleration will be close to 9.8 m/s², before air resistance starts to become significant.
Note:
* Terminal Velocity: As an object falls, air resistance increases. Eventually, it will reach a point where the force of air resistance equals the force of gravity. At this point, the object stops accelerating and falls at a constant velocity called terminal velocity.
