Skydiving Free Fall
The time a skydiver spends between leaving the aircraft and opening a parachute is often called the “free fall” time. During a recreational skydive the “free fall” time is about one minute. The current record “free fall” time of about 5 minutes was set by Alan Eustace in 2014 when he fell from an altitude of more than 135,000 feet. According to the Paragon Space Development Corporation, “Eustace reached top of over 800 miles per hour. He was going so fast that his body broke the , creating a that could be heard on the ground.” The jump broke the previous record of 127,852 feet set by Felix Baumgartner in 2012. The 2012 jump was sponsored by GoPro cameras and the video has a much higher production value than the more recent 2014 jump:
Physics Free Fall
Now that we have introduced the skydiver’s use of the term free fall, we need to recognize that physics uses the term free fall in a completely different way, so we will need to be careful to avoid confusion. In physics, and in this book, we use the term to describe the motion of an object when is the ONLY force acting on the object. Skydivers experience gravity and , so technically they are not in free fall.
distance traveled per unit time
sudden increase in aerodynamic drag and other undesirable effects experienced by an object when it approaches the speed of sound
the sound associated with the shock waves created whenever an object travelling through the air travels faster than the speed of sound
the motion experienced by an object when gravity is the only force acting on the object.
attraction between two objects due to their mass as described by Newton's Universal Law of Gravitation
a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid